Key Stage 3 Science

Transcription

Key Stage 3 Science

Key Stage 3 Science
Unit Questions & Answers Reference Guide
23/10/2009
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This document contains all of the answers to the Key Stage 3 Science Units listed below. This document is for
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Contents
KS3 Science Unit 7A: Cells ................................................................................................................................ 4
KS3 Science Unit 7B: Reproduction ................................................................................................................. 9
KS3 Science Unit 7C: Environment and feeding relationships ................................................................... 14
KS3 Science Unit 7D: Variation and classification ........................................................................................ 19
KS3 Science Unit 7E: Acids and alkalis ......................................................................................................... 24
KS3 Science Unit 7F: Simple chemical reactions ......................................................................................... 29
KS3 Science Unit 7G: Particle model of solids, liquids and gases ............................................................. 34
KS3 Science Unit 7H: Solutions ...................................................................................................................... 39
KS3 Science Unit 7I: Energy resources ......................................................................................................... 44
KS3 Science Unit 7J: Electrical circuits .......................................................................................................... 49
KS3 Science Unit 7K: Forces and their effects ............................................................................................. 54
KS3 Science Unit 7L: The solar system and beyond ................................................................................... 59
KS3 Science Unit 8A: Food and digestion ..................................................................................................... 64
KS3 Science Unit 8B: Respiration ................................................................................................................... 69
KS3 Science Unit 8C: Microbes and disease ................................................................................................ 74
KS3 Science Unit 8D: Ecological relationships ............................................................................................. 79
KS3 Science Unit 8E: Atoms and elements ................................................................................................... 84
KS3 Science Unit 8F: Compounds and mixtures .......................................................................................... 89
KS3 Science Unit 8G: Rocks and weathering ............................................................................................... 94
KS3 Science Unit 8H: The rock cycle ............................................................................................................. 99
KS3 Science Unit 8I: Heating and cooling ................................................................................................... 104
KS3 Science Unit 8J: Magnets and electromagnets .................................................................................. 109
KS3 Science Unit 8K: Light ............................................................................................................................ 114
KS3 Science Unit 8L: Sound and hearing .................................................................................................... 119
KS3 Science Unit 9A: Inheritance and selection ......................................................................................... 124
KS3 Science Unit 9B: Fit and healthy ........................................................................................................... 129
KS3 Science Unit 9C: Plants and photosynthesis ...................................................................................... 134
KS3 Science Unit 9D: Plants for food ........................................................................................................... 139
KS3 Science Unit 9E: Reactions of metals and metal compounds .......................................................... 144
KS3 Science Unit 9F: Patterns of reactivity ................................................................................................. 149
KS3 Science Unit 9G: Environmental chemistry ......................................................................................... 154
KS3 Science Unit 9H: Using chemistry ........................................................................................................ 159
KS3 Science Unit 9I: Energy and electricity................................................................................................. 164
KS3 Science Unit 9J: Gravity and space...................................................................................................... 169
KS3 Science Unit 9K: Speeding up ............................................................................................................... 174
KS3 Science Unit 9L: Pressure and moments ............................................................................................ 179
KS3 Science Unit 9M: Investigating scientific questions............................................................................ 184
KS3 Science Unit 7A: Cells
Exercise No: 1
Name: Cells the Basics
Question Type: Missing Part
No.1: Animal Cells
Question
Answers
Animal cells have 3 basic parts, they are, _______ and the cytoplasm.
Correct Answer
the nucleus, the cell membrane
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the nucleus, the cell wall
the nucleus, the chloroplasts
the cell wall, the cell membrane
Question Type: Statement Choice
No.2: Plant cells
Question
Which part of a plant cell allows the plant to make food by absorbing light energy?
Answers
Correct Answer
Chloroplast
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Vacuole
Cytoplasm
Nucleus
No.3: Comparing Cells
Question
Animal and plant cells have a number of differences, animal cells are an irregular shape also,
they do not have _______ but plant cells have both these things and a large vacuole.
Answers
Correct Answer
a cell wall and chloroplasts,
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a nucleus and a cell wall,
chloroplasts and a cell membrane,
the cell wall, the cell membrane,
Question Type: Multiple Choice
No.4: Specialised Cells
Question
Answers
Which of these are specialised features of a sperm cell?
Correct Answer
Correct Answer
A head containing chemicals to help it burrow through jelly.
A tail to help it swim.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Chloroplasts to help make food.
Hairs for wafting.
No nucleus so they can transport more oxygen.
Exercise No: 2
Name: Looking at cells in more detail.
No.5: Microscopes
Question
Which 2 parts of a microscope magnify the image?
Answers
Correct Answer
Correct Answer
Eye piece
Objective lens
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Stage
Mirror
Fine Adjustment
No.6: cell components
Question
Which cell component is common to both plant and animal cells and is the part where chemical
reactions happen?
Answers
Correct Answer
Cytoplasm
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Nucleus
Membrane
Vacuole
No.7: The Nucleus
Question
Answers
Which of these is NOT a job of the nucleus?
Correct Answer
To control what goes in and out of the cell.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
To control the structure of the cell.
To control the activities of the cell.
To hold the genetic material.
No.8: Making New Cells
Question
Which part of a cell divides first when a new cell is being made?
Answers
Correct Answer
Nucleus
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cytoplasm
Membrane
Cell Wall
Exercise No: 3
Name: Levels of organisation
No.9: Groups of cells
Question
A group of cells combines to make a _______ and one example is blood
Answers
Correct Answer
tissue
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
human
system
organ
No.10: Animal Organs
Question
Answers
Which organ has the job of delivering oxygen to and removing carbon dioxide from your blood?
Correct Answer
Lungs
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Brain
Liver
Heart
No.11: Plant organs
Question
Leaves are adapted to carry out photosynthesis - which 2 things are made by the leaf cells during
photosynthesis?
Answers
Correct Answer
Correct Answer
Oxygen
Food (glucose)
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Energy
Water
Carbon Dioxide
No.12: Systems
Question
Which organ system controls the way animals respond to the environment and is made up of the
brain and the spinal cord?
Answers
Correct Answer
Nervous System
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Urinary System.
Breathing System
Circulatory Cystem
Exercise No: 4
Name: Making new plants
No.13: Flowers
Question
Which of these are the male parts of a flower?
Answers
Correct Answer
Correct Answer
Anther
Filament
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Stigma
Style
Ovary
No.14: Pollen
Question
Answers
For pollination to happen, _______ to the stigma
Correct Answer
pollen must move from the stamen
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
pollen must move from the pistil
ova must move from the the stamen
sperm must move from the stamen
No.15: 15 Pollination
Question
Answers
How do plants attract pollinators?
Correct Answer
Bright petals and sweet nectar.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Sticky stamens and bright petals.
Bright sepals and sweet nectar.
Sticky stigma and sweet nectar.
No.16: Pollen tubes
Question
What travels down the pollen tube to the ovule?
Answers
Correct Answer
The Sperm cell nucleus
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The Embryo
The Pollen Cell
The Seed
Peer Assessment Question and Expert Answer
Question
What are the similarities and differences between plant and animal cells and what do the
different parts do?
Expert
Teacher
Answer
Both types of cell have nucleus to control the cell, a membrane to let things in and out of the cell
and a cytoplasm where chemical reactions happen. Plants cells have a large vacuole containing
sap (animals cells sometimes have small vacuoles). Plant cells also have a cell wall to keep them
rigid and chloroplasts to help the plant make food by photosynthesis
KS3 Science Unit 7B: Reproduction
Exercise No: 1
Name: 1. How does a new life start?
No.1: 1. Specialist Cells
Question
Answers
Which cells carry genetic information from a father to make a new offspring?
Correct Answer
Sperm cells.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Egg cells.
Reproduction cells.
Nerve cells.
Question Type: Ranking
No.2: 2. Growing up
Question
Look at these stages in a human life. Put them in order starting with the youngest.
Answers
Correct Order
D-E-A-B-C
Statement A
Statement B
Statement C
Statement D
Statement E
Teenager.
Middle age.
Old age.
Baby.
Child.
No.3: 3. Adolescence
Question
Answers
All boys and girls go through the stage of development called _______ as they grow up.
Correct Answer
puberty
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
priority
property
puppetry
No.4: 4. Development in boys
Question
Which one of these statements is true?
Answers
Correct Answer
The testes lie in a sac called a scrotum.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Sperm needs to be kept at body temperature.
The tube that carries the sperm out of the body is called the uterus.
The tail of the sperm contains the genes.
Exercise No: 2
Name: 2. How do humans change as they grow?
No.5: 5. Puberty in girls
Question
The ovaries release the female sex hormone, _______ which triggers the development of breasts
and hips in adolescent girls.
Answers
Correct Answer
oestrogen
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
menstrone
testosterone
glucogen
No.6: 6. Menstrual Cycle
Question
Once a girl enters puberty, she normally goes through a menstrual cycle every month. Which of
the following answers is the correct definition of the menstrual cycle?
Answers
Correct Answer
The monthly reproductive cycle in a female.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A period.
The breakdown of the wall of the uterus.
The process by which a baby is made.
No.7: 7. Human Reproductive System
Question
Which TWO of the following are TRUE?
Answers
Correct Answer
Correct Answer
A single ejaculation can release about two million sperm.
The sperm swim up through the uterus and into the fallopian
tube.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The release of semen from a man's penis is called an erection.
Adult males produce and store all their sperm in puberty.
If the sperm get into the fallopian tube then the female will become
pregnant.
No.8: 8 How does a new life start?
Question
Answers
Why do frogs and toads produce so many embryos?
Correct Answer
Because many tadpoles are eaten by predators.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
To make sure pondweed is eaten.
Because tadpoles eat many predators.
To increase the food available for fish.
Exercise No: 3
Name: 3. How is the human foetus supported as it grows?
No.9: 9. Fertilisation in the woman
Question
Fertilisation occurs in the _______ and an embryo develops in the uterus.
Answers
Correct Answer
fallopian tube
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
cervix
uterus
vagina
No.10: 10. Birth of the baby
Question
Answers
Complete this sentence: In order for a baby to be born, the muscles in the wall of the uterus
Correct Answer
contract to push the baby down the birth canal.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
relax to let the baby be born.
tighten and stretch to push the baby down the birth canal.
stretch to let the baby be born.
No.11: 11. The role of the placenta
Question
Which TWO of the following statements are correct?
Answers
Correct Answer
Correct Answer
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
No.12: 12 How the foetus develops
The placenta passes food, oxygen and water from the mother’s
blood to the baby’s blood.
The placenta passes carbon dioxide and waste from the baby’s
blood to the mother’s blood.
The placenta passes food, oxygen and water from the baby’s blood to
the mother’s blood.
The placenta passes carbon dioxide and waste from the mother’s
The placenta passes food, carbon dioxide and water from the mother’s
Question
Respiration is when cells use oxygen to provide energy. Which of the following processes are
connected to respiration?
Answers
Correct Answer
Oxygen diffusing into the baby's blood in the placenta.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Oxygen diffusing out of the baby's blood in the placenta.
The joining of the two nuclei from a sperm cell and an egg cell.
Nicotine passing through the placenta to the foetus.
Exercise No: 4
Name: 4. Health issues during and after pregnancy
No.13: 13 The effects of smoking on the developing foetus
Question
Chemicals in mother's bloodstream may effect the _______ reducing healthy baby growth.
Answers
Correct Answer
foetus,
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
cervix,
uterus,
placenta,
No.14: 14 Drugs and pregnancy
Question
Answers
Why is it unwise to smoke or take drugs during pregnancy?
Correct Answer
They can slow the growth of the baby leading to a low birth
weight.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They can increase the birth weight of the baby.
It isn't unwise as they can make you feel better when you give birth.
It's OK, there is no evidence that they have any effect.
No.15: 15. How offspring are protected and nurtured
Question
In the early stages of development, newborn young of most mammals and birds _______ to help
them survive and keep healthy.
Answers
Correct Answer
stay with parents, for warmth, food and protection
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
look for their own food and protection
leave their parents as soon as possible
need to find a mate
No.16: 16. Child development
Question
How long does it take an average human child before they can walk?
Answers
Correct Answer
9-12 months.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
36 months.
24 months.
3 months.
Question
The way frogs and humans reproduce and care for their young are different. Describe
these differences. Suggest a reason why frogs produce so many tadpoles.
Expert
Teacher
Answer
Frogs use external fertilisation. They have to be in water to make this successful. The female lays
100s of soft bodied eggs and the male releases sperm at the same time. Some of the eggs may
not get fertilised, some of them will be eaten by predators. The frogs do not show any care for
their offspring. Humans use internal fertilisation. There is more chance of a sperm fertilising an
ovum, so only one or two are released on a monthly cycle. Babies are nurtured for many years
before they are independent. Frogs produce so many tadpoles to increase the chances of
survival. Many will not reach maturity because they will have been eaten. Humans do not need to
produce so many young because as they are nurtured for such a long time, there is a greater
chance of survival.
KS3 Science Unit 7C: Environment and
feeding relationships
Exercise No: 1
Name: Habitats 2
No.1: Habitats around Britain
Question
Answers
Which of the following statements about habitats in Britain is INCORRECT?
Correct Answer
Rivers, ponds, lakes and canals are all freshwater habitats and
the same species live there.
Incorrect Answer 1
Gardens, parks and churchyards all support a wealth of wildlife, and
more and more wildlife is adapting to town or city environments.
Wildlife has evolved and adapted to live in specialised habitats.
A habitat is somewhere which provides shelter, food and somewhere
to breed.
Incorrect Answer 2
Incorrect Answer 3
No.2: Desert Journey
Question
Which TWO of these statements about desert plants are CORRECT?
Answers
Correct Answer
Correct Answer
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They need to have the ability to collect and store water to live
there.
They need to have features that reduce water loss to live there.
They usually grow very quickly.
Desert plants need less water for photosynthesis than woodland
plants.
They do not need deep roots.
No.3: Pond dipping
Question
Answers
Water flea populations survive in ponds that dry up in the summer because:
Correct Answer
they can produce drought-resistant eggs.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
they are eaten by fish and birds.
the adults are adapted to dry conditions.
they can hibernate.
No.4: Harsh conditions
Question
Evergreen trees often have narrow, needle-like leaves and a thick waxy coating. These
adaptations help them to
Answers
Correct Answer
conserve water during winter.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
conserve sugar and starch during winter.
conserve sunlight during winter.
conserve energy during winter.
KS3 Science Unit 7C: Environment and feeding relationships
Exercise No: 2
Name: Adaptations
No.5: Surviving winter
Question
An adaptation is:
Answers
Correct Answer
a body part or behavior that helps an animal meet its needs.
Incorrect Answer 1
Incorrect Answer 2
something that animals need to live in very hot or cold places.
a behaviour like burrowing underground to avoid heat, cold or
predators.
a feature like having thick fur to stay warm.
Incorrect Answer 3
No.6: Hibernation
Question
Answers
Which TWO of the following statements about hibernation are correct?
Correct Answer
Correct Answer
Animals hibernate because their food supply runs out.
Animals hibernate because they are not adapted to survive in
cold temperatures.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Insects don't hibernate.
Amphibians don't hibernate.
Bats and hedgehogs hibernate in the summer.
No.7: Camouflage
Question
Which one of the following is NOT a reason why animals have different colours and patterns?
Answers
Correct Answer
To help them stand out from the crowd.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
To mimic other animals that are poisonous.
To warn predators that they are poisonous.
To help to camouflage them.
No.8: Bird bills
Question
Answers
Why do the water birds in one habitat have different shaped bills?
Correct Answer
So they can use different sources of food.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
To avoid each other.
So they do not have to hibernate.
So they can avoid predators.
Exercise No: 3
Name: Food chains
No.9: Food chains
Question
Four students wrote a sentence about food chains. Which one needs more help with his topic?
Answers
Correct Answer
Eniola:They have arrows that point from each animal to its source
of food.
Incorrect Answer 1
Incorrect Answer 2
Karis:They show how organisms depend on each other for food.
Jo:They show producers being eaten by consumers and these
consumers being eaten by predators.
Sam:They show how energy from the sun gets passed from the plants
that absorb it to the animals that eat them.
Incorrect Answer 3
No.10: Passing on energy
Question
Which TWO of the following can be used to describe the second consumer in a food chain?
Answers
Correct Answer
Correct Answer
Carnivore.
Predator.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Prey.
Herbivore.
Omnivore.
No.11: A longer chain
Question
Which TWO of the following are not proper food chains?
Answers
Correct Answer
Correct Answer
Leaf -> insect -> herbivore -> predator.
Leaf -> carnivore -> predator.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Tree -> prey animal -> predator.
Plant material -> herbivore -> carnivore.
Algae -> herbivore -> carnivore -> larger carnivore.
No.12: Predators and prey
Question
Which TWO statements about a food chain are CORRECT?
Answers
Correct Answer
Correct Answer
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Producers will grow more if their consumers are wiped out by
disease.
If the herbivores are wiped out by disease the carnivore
population will drop.
There are always more consumers than producers.
There are always more carnivores than herbivores.
The more carnivores there are, the bigger the herbivore population
gets.
Exercise No: 4
Name: Food webs
No.13: Linked food chains
Question
Four students explained why food webs are more useful than food chains. Which one got it
wrong?
Answers
Correct Answer
Bradley: Animals keep moving around so their food chains keep
crossing over.
Incorrect Answer 1
Lucy: One animal can be food for several others. e.g. rats eat birds
eggs, owls catch the adults and decomposers use anything that is left.
Sam: There are often several different animals competing for the same
food.
Jess: Producers are often eaten by more than one consumer and
herbivores often eat different things at different times of the year.
Incorrect Answer 2
Incorrect Answer 3
No.14: Decomposers
Question
Answers
Which of the following statements is false?
Correct Answer
Decomposers like worms, bacteria and fungi take food away from
food chains.
Incorrect Answer 1
Decomposers are important in many food webs because other animals
feed on them.
The prey animals in many food chains feed on dead plant material.
Decomposers break down dead plants and animals and their waste
products.
Incorrect Answer 2
Incorrect Answer 3
No.15: Spotting links
Question
Humans dominate most food webs because:
Answers
Correct Answer
they use producers as sources of raw materials as well as food.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
they eat many different types of plant.
they eat plants and animals.
they eat many different animals.
No.16: Review
Question
Answers
Which of these indicate that the hawk is likely to be a predator?
Correct Answer
Their eyes point directly forwards to give them good judgement
of distance.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They have a wide field of view.
They have a good sense of smell.
They can fly quite fast.
Question
In the past people have taken wild animals, like rabbits to new countries.They have been
released into the wild and become successful. What are the main things that would ensure
their success?
Expert
Teacher
Answer
They can find a suitable habitat with food, water, a suitable climate and few competitors or
predators. They will need to find a mate and reproduce. If there are predators they will need to be
camouflaged or able to escape.
KS3 Science Unit 7D: Variation and
classification
Exercise No: 1
Name: Variation
No.1: Similarities and differences
Question
Answers
Four students wrote about how we resemble our parents. Which of them needs a bit more help?
Correct Answer
Sophie: All our characteristics are inherited from our parents.
Incorrect Answer 1
Incorrect Answer 2
Darren: We are all similar to our parents but not identical to them.
Kate: The children in one family can inherit different characteristics
from their parents.
Dev: Some things like eye colour are inherited from parents. Other
characteristics, like how fit we are, depend on how much exercise we
take.
Incorrect Answer 3
No.2: Weight and height
Question
Characteristics like weight and height are caused by a combination of _______ factors.
Answers
Correct Answer
inherited and environmental
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
inherited
environmental
uncontrolled
No.3: Human variation
Question
Answers
Which of the following is true?
Correct Answer
Common illnesses like heart disease, asthma and diabetes are all
partly influenced by genes and partly by your environment.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Genes only carry instructions for building a healthy body.
Everyone becomes ill when their living conditions are poor.
Environmental factors reduce the differences between members of a
population.
No.4: Individual differences
Question
Fingerprints can be used instead of passwords because:
Answers
Correct Answer
No two fingerprints are exactly the same.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Fingerprints are inherited.
Passwords are easily forgotton.
Fingerprints are hard to copy.
KS3 Science Unit 7D: Variation and classification
Exercise No: 2
Name: Inherited characteristics
No.5: Achieving your potential
Question
Even if you inherit genes for tallness you will not grow tall unless you:
Answers
Correct Answer
have a good diet while you are growing.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
inherit tallness from both parents.
get enough exercise.
have very tall parents.
No.6: Describing differences
Question
Karis has made a key to identify woodland animals. She needs a question that will separate
squirrels from rabbits. Which of these would be best?
Answers
Correct Answer
Does it have a long tail?
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Does it eat acorns?
Does it live in woodland?
Is it a mammal?
No.7: Common characteristics
Question
Four students wrote about why brothers and sisters are not identical. Which student has the
wrong idea?
Answers
Correct Answer
Each child inherits the same characteristics from their parents.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
We inherit a random selection of characteristics from each parent.
Both plants and animals have inherited characteristics.
Each child is exposed to different environmental factors and these
affect their characteristics.
No.8: Classifying fingerprints
Question
Which of the following is NOT a fingerprint group?
Answers
Correct Answer
Hoop.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Arch.
Whorl.
Loop.
Exercise No: 3
Name: Classification
No.9: Grouping animals
Question
Which statement is false?
Answers
Correct Answer
Birds are the only animals that lay eggs.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Bats are mammals that can fly.
Whales produce live young so they are mammals.
Snakes have backbones so they are vertebrates.
No.10: Classification
Question
Answers
Which set of characteristics belongs to amphibians?
Correct Answer
Adults have moist, naked skin and young live in water and have
gills.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Animals like toads, newts, salamanders and turtles.
Animals like snakes and lizards.
Cold-blooded with dry scaly skin.
No.11: Groups within groups
Question
Answers
Which of the following statement is not true?
Correct Answer
All vertebrates are mammals.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
All rodents are mammals.
All mammals are vertebrates.
Squirrels and humans are both classified as mammals.
No.12: Reptiles and amphibians
Question
Which TWO of the following are true about reptiles and amphibians?
Answers
Correct Answer
Correct Answer
Their young hatch from eggs.
They are cold-blooded.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They have scaly skin.
Their young live in water.
They have dry, rough, scaly skin.
Exercise No: 4
Name: Invertebrates
No.13: Invertebrates
Question
Which of these statements is false?
Answers
Correct Answer
Slugs are arthropods.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Most animals are invertebrates.
Crabs and insects are both arthropods.
Most invertebrates are arthropods.
No.14: Classifying invertebrates
Question
Answers
What makes arachnids different from insects?
Correct Answer
They have an extra pair of legs.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They are all spiders.
They are invertebrates.
They have jointed legs.
No.15: Review
Question
What two steps can be carried out to classify a newly discovered animal?
Answers
Correct Answer
Correct Answer
See if it fits into an existing group.
If it is not like any known animal, extend the classification
system.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Look it up in a key.
Find out where it lives.
Name the animal after the person who discovered it.
No.16: Test
Question
Answers
Scientific classification is important because:
Correct Answer
it is used worldwide to provide a systematic way of studying
living things.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
animals can be subdivided into vertebrates and invertebrates.
vertebrates include mammals, birds, fish, reptiles, amphibians.
invertebrates can be subdivided into smaller groups.
Question
Describe the way in which living organisms are classified, including the characteristics of
each group.
Expert
Teacher
Answer
Living organisms can first of all be split into plants and Living organisms can first of all be split into
plants and animals. Plants make their own food and have roots; animals move about and eat
other organisms. Animals can be split into two groups: vert
KS3 Science Unit 7E: Acids and alkalis
Exercise No: 1
Name: What are Acids?
No.1: Safety
Question
Answers
Which of the following are examples of acids in everyday use?
Correct Answer
Vinegar, hydrochloric acid, orange juice.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Water, sodium hydroxide, alcohol.
Vinegar, oven cleaner, soap.
ammonia, soap, toothpaste.
No.2: Acids
Question
The main use of sulphuric acid is to make
Answers
Correct Answer
fertilisers
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
plastics
detergents
paints
No.3: Alkalis
Question
Which of these statements is correct?
Answers
Correct Answer
Alkalis are soapy to touch and corrosive.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Alkalis are found in oven cleaners, indigestion remedies and vinegar.
Alkalis do not react with acids.
Alkalis have pH lower than 7.
No.4: Symbols
Question
Put the descriptions of the hazard symbols into the same order as in this list. Irritant, corrosive,
toxic, highly flammable, explosive.
Answers
Correct Order
D-B-A-E-C
Statement A
Could cause harm if the chemical comes into contact with skin, if ingested
or if vapours are breathed in.
Chemical cause burns if it comes into contact with the skin.
Chemical could cause an explosion.
Damages skin or eyes if they come into contact with the chemical.
Can easily catch fire.
Statement B
Statement C
Statement D
Statement E
Exercise No: 2
Name: Telling them apart
No.5: Acid or Alkali
Question
What do we call solutions of dyes which show one colour for acids and another for alkalis?
Answers
Correct Answer
Indicators
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
PH Indicators
Acid Indicators
Alkali Indicators
No.6: Indicators
Question
Answers
If you had made your own indicator and it is red, what colour would it be if you dipped it in water?
Correct Answer
red
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
blue
green
purple
No.7: pH
Question
If you tested something and it had a pH value of 8, what would this mean?
Answers
Correct Answer
It is a weak alkali.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It is a weak acid.
It is neutral.
It is a strong alkali.
No.8: Predict and discover
Question
Which substance was the strongest alkali?
Answers
Correct Answer
Liquid Plumber
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Vinegar
Milk of Magnesia
Baking powder
Exercise No: 3
Name: Mixing
No.9: Ions
Question
If a solution contains a lot of H+ ions, what will the likely reading be on the pH scale?
Answers
Correct Answer
Between 1 and 4
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Between 5 and 7
Between 11 and 14
Between 7 and 10
No.10: Neutralisation
Question
Answers
Which salt would be made if you neutralised Nitric acid with Potassium Hydroxide?
Correct Answer
Potassium Nitrate
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Potassium Chloride
Potassium Sulphate
Sodium Nitrate
No.11: Salts
Question
Which statement about salts is incorrect?
Answers
Correct Answer
Salt is only something used to flavour food.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Salt is used to preserve foods.
Salt is used to stop water on roads from freezing in winter.
Some salts can be used as moss killer and for Plaster of Paris.
No.12: Reactions
Question
Which of these statements is INCORRECT?
Answers
Correct Answer
Neutralisation only produces a salt and water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Neutralisation can produce just a salt and water.
Neutralisation can produce a salt, water and a gas.
Acids can be neutralised by metal oxides.
Exercise No: 4
Name: Neutralisation
No.13: Industry and home
Question
Which of the following statements is true?
Answers
Correct Answer
The chemical name for table salt is sodium chloride.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The chemical name for table salt is sodium sulphate.
Brine is the name of the salt found underground.
All salts can be used to flavour food.
No.14: Acid Rain
Question
Answers
Which TWO of the following statements about acid rain are correct?
Correct Answer
Correct Answer
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Acid rain is a mild solution of sulphuric acid and nitric acid,
produced as fossil fuels are burned
Acid rain is harmful to plants, animals, lakes, rivers and
buildings.
Acid rain is not a major problem for countries like England.
There is nothing that I can do to help reduce the problems that acid
rain causes.
Acid rain contains large amounts of sodium hydroxide.
No.15: Neutralisation and farmers
Question
Which TWO of the following words will complete this sentence correctly? If soil is too acidic,
plants cannot take certain nutrients like .... and magnesium. Similarly, if soil is too .... , plants
cannot take up iron or zinc.
Answers
Correct Answer
Correct Answer
calcium
alkaline
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
acidic
zinc
neutral
No.16: Everyday neutralisations
Question
Choose the correct order for the words below to complete the sentences: Bee stings can be
treated with..... whilst ........is best for wasp stings. Most plants grow best in soil which is
slightly....... If the pH of the soil is too high it can be lowered by adding.... Taking indigestion
remedies to combat stomach ache is an example of ....
Answers
Correct Order
C-E-A-B-D
Statement A
Statement B
Statement C
Statement D
Statement E
acidic
lime
alkali
neutralisation
vinegar
Question
What do we mean when we say "Acids and alkalis are all around us"?
Expert
Teacher
Answer
Acids and alkalis are in many things that are in everyday use. Carbonated drinks, fruit drinks and
aspirin are examples of weak acids. Baking powder, antacids, soap are examples of weak alkalis.
Strong acids and alkalis are corrosive and are found in laboratories and are used by industries.
The acid in our stomachs is a strong acid. Acids and alkalis can be used to neutralise each other.
Alkaline antacid tablets can be used to neutralise excess acid in the stomach and, as vinegar is a
weak acid, it can be used to neutralise wasp stings, which are alkaline. The neutralisation process
produces a salt + water, and sometimes a gas as well. The salts that are produced are very
useful e.g. Bath Salts, Epsom Salts, fertilisers, sodium chloride - ordinary salt that has many uses.
KS3 Science Unit 7F: Simple chemical
reactions
Exercise No: 1
Name: Reactions
No.1: 1. Chemical reactions
Question
Answers
A chemical reaction always:
Correct Answer
makes a new substance.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
happens very quickly.
makes a gas.
produces a bright light.
No.2: 2. Tell-tale signs.
Question
If _______ this is NOT evidence that a chemical reaction has happened.
Answers
Correct Answer
a powder dissolves in a liquid
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
two colourless solutions turn yellow when mixed
two solutions get hotter when they are mixed
a liquid fizzes when some crystals are added
No.3: 3. Making oxides
Question
Which TWO new products always form when a fuel burns?
Answers
Correct Answer
Correct Answer
Oxides, like carbon dioxide.
Water.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Steam.
Heat.
Smoke.
No.4: 4. Releasing gas
Question
What happens when magnesium is put in hydrochloric acid - HCl for short?
Answers
Correct Answer
The acid fizzes because one of the products is a gas.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The acid spits out of the tube.
The magnesium disappears.
The magnesium makes a bright white light.
KS3 Science Unit 7F: Simple chemical reactions
Exercise No: 2
Name: Changing metals
No.5: 5. Reacting metal with acid
Question
What happens when copper is dropped into acid?
Answers
Correct Answer
Nothing. Copper does not react with acid.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It gradually dissolves.
It does not make as many bubbles as zinc.
It reacts to make a soluble salt and hydrogen gas.
No.6: 6. Collecting hydrogen
Question
Most metals react with acid. One of the products is a gas called hydrogen. Where does the
hydrogen come from?
Answers
Correct Answer
The hydrogen was originally part of the acid.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The metal turns into hydrogen when it reacts.
The hydrogen atoms are created during the reaction.
The acid makes the gas come out of the metal.
No.7: 7. Testing for hydrogen.
Question
Which is the best way to prove that a gas jar contains hydrogen?
Answers
Correct Answer
Take off the lid and hold a lit splint over it.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Plunge a lit splint into the jar.
Hold a glowing splint over the open jar.
Plunge a glowing splint into the jar.
No.8: 8. Salts
Question
What TWO products are formed when acids react with metals?
Answers
Correct Answer
Correct Answer
Salts.
Hydrogen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Soluble compounds.
Chlorides.
Sodium chloride.
Exercise No: 3
Name: Changing carbonates
No.9: 9. Reacting acids with carbonates
Question
What happens to rocks that contain carbonates when acid drips on them?
Answers
Correct Answer
The carbonates react and make a gas.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The rock turns into a gas.
The carbonates dissolve and leave a hole in the rock.
The acid soaks into the rock.
No.10: 10. Collecting carbon dioxide
Question
Answers
Where does the carbon dioxide come from when marble chips react with acid?
Correct Answer
The atoms in the gas started off in the calcium carbonate.
Incorrect Answer 1
Incorrect Answer 2
The gas came from the acid.
Marble contains bubbles of carbon dioxide which leak out when it
reacts.
The atoms in the gas were made during the reaction.
Incorrect Answer 3
No.11: 11. Testing for carbon dioxide
Question
Answers
If a gas _______ then the gas is definitely carbon dioxide.
Correct Answer
turns limewater milky,
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
does not pop with a lit splint,
makes limewater go clear,
is produced when something reacts with acid,
No.12: 12. Baking powder
Question
Baking powder releases carbon dioxide to make cakes rise. Which TWO of the following could be
used together to make baking powder?
Answers
Correct Answer
Correct Answer
A carbonate.
A weak acid like cream of tartar.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A powdered metal.
A salt.
A dry acid.
Exercise No: 4
Name: Reactions with oxygen
No.13: 13. Burning
Question
When zinc burns in pure oxygen the equation is:
Answers
Correct Answer
zinc + oxygen -> zinc oxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
oxygen + zinc -> oxidised zinc
zinc + oxide -> zinc oxide
zinc + dioxide -> zinc dioxide
No.14: 14. Burning hydrocarbons
Question
Answers
The carbon in fuels _______ when a fuel burns.
Correct Answer
combines with oxygen to form carbon dioxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
all turns to soot
is destroyed
turns to ash
No.15: 15. Burning methane
Question
Which of the equations below describes what happens when methane burns?
Answers
Correct Answer
methane + oxygen -> carbon dioxide + water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
hydrocarbon fuel -> carbon dioxide + water
methane + oxygen -> methane oxide
carbon + hydrogen + oxygen -> carbon dioxide + water
No.16: 16. Using up oxygen
Question
A candle will burn under a glass jar. You need to _______ to make the candle burn for longer.
Answers
Correct Answer
use a bigger jar
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
use a fatter candle
use a taller candle
use a candle with a longer wick
Question
Barbara's chemistry teacher said, 'Chemistry is easy. Just learn what forms when
magnesium burns or reacts with acid. Then you will be able to work out what any other
metal would form.' Say whether or not you agree with the teacher and explain you reasons
Expert
Teacher
Answer
I mostly agree. When magnesium burns the equation is: Magnesium + Oxygen -> Magnesium
Oxide. Other metals have similar equations but they don't all burn as brightly as magnesium.
When magnesium reacts with acid it always makes a salt and hydrogen gas. Most other metals
do the same, but copper does not react with acid. Also, there are a lot of different salts. When the
metal or the acid changes, the name of the salt changes. So the reactions are not exactly the
same.
KS3 Science Unit 7G: Particle model of
solids, liquids and gases
Exercise No: 1
Name: What is Chemistry ?
No.1: What is chemistry?
Question
Answers
Which TWO of the following are physical properties of a substance ?
Correct Answer
Correct Answer
density
hardness
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
size
shape
mass
No.2: Elements,compounds and mixtures
Question
Answers
What phase were all the microscopic views of the elements, compounds and mixtures in?
Correct Answer
gas
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
solid
liquid
plasma
No.3: Matter
Question
When ice freezes what is changing?
Answers
Correct Answer
The physical state.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The chemical state.
The molecules
The atoms.
No.4: Changing states
Question
The state of matter of a substance depends on its _______ This changes how much it's particles
move and therefore the space between the particles.
Answers
Correct Answer
temperature.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
heat
shape
colour
KS3 Science Unit 7G: Particle model of solids, liquids and gases
Exercise No: 2
Name: Solids, Liquids and Gases
No.5: Solids 2
Question
One of the main characteristics of a solid is that they
Answers
Correct Answer
hold their own shape.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
are strong.
can be poured.
are very heavy.
No.6: Liquids(2)
Question
Answers
Which of the following can be said about liquids ?
Correct Answer
They cannot be compressed
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They do not keep their volume
They keep their shape
They cannot be poured
No.7: Liquids 3
Question
Which two of these statements are not true about gases?
Answers
Correct Answer
Correct Answer
They have a fixed shape
They cannot be poured
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They spread out whenever they can
They do not keep their volume
Their particles move fast and freely
No.8: More on liquids
Question
How do the molecules in liquid bromine and liquid water move?
Answers
Correct Answer
As units they vibrate, move about, and slide past each other
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
As atoms
Slowly
As quickly as they can
Exercise No: 3
Name: Structure and Behaviour
No.9: Solids ,liquids and Gases and their molecular st
Question
Put the following in order of the fastest moving particles to slowest moving particles.
Answers
Correct Order
E-C-B-D-A
Statement A
Statement B
Statement C
Statement D
Statement E
very cold solid
liquid
cold gas
warm solid
Hot gas
No.10: Physical changes and particles
Question
At what temperature does water start to freeze? (degrees C)
Answers
Correct Answer
0
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
-1
4
2
No.11: Characteristics and behaviour
Question
Answers
Gases are compressible because?
Correct Answer
they have lots of space between particles
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
they are light
their particles are always moving
the particles can move past one another
No.12: Temperature and phases of matter
Question
Answers
In which substance or substances are the atoms or molecules fixed together in their solid phase?
Correct Answer
Water, copper and nitrogen
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Water
Copper
Water and copper
Exercise No: 4
Name: More about particle models
No.13: More about liquids and changing state
Question
The point at which a gas turns into a liquid is called the _______ point.
Answers
Correct Answer
condensation
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
freezing
melting
boiling
No.14: Expansion and contraction
Question
In a combustion engine fuel is mixed with air in a container fixed with a piston. The fuel burns and
the heat causes the gases to _______. This pushes out the piston and it is this movement that is
used to drive the wheels.
Answers
Correct Answer
expand
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
contract
increase
multiply
No.15: Using particle models to explain properties
Question
Answers
The way gas particles spread out is called
Correct Answer
diffusion
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Brownian motion
endothermic
sublimation
No.16: Revision game
Question
Which of the following metals is a liquid at room temperature?
Answers
Correct Answer
Mercury.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Iron.
Magnesium.
Sodium.
Question
Describe the three states of matter, you must mention their properties and the
arrangement of their particles.
Expert
Teacher
Answer
The three states of matter are solids, liquids and gases. In solids the particles are fixed together,
they stay in the same place but are constantly vibrating. This means that solids keep their shape,
do not flow and cannot be compressed. In liquids the particles can slide past each other this
means they can flow and they assume the shape of the part of the container that they occupy .
There is little if any space between the particles so that liquids cannot be compressed. In gases
the particles are not touching with large spaces between them and are moving very rapidly. This
means that gases can be compressed and that they spread out to fill the shape of their container.
KS3 Science Unit 7H: Solutions
Exercise No: 1
Name: Mixtures
No.1: Some solids dissolve in liquids and others do
Question
Answers
What do we call a solid that does dissolve in water?
Correct Answer
Soluble
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Insoluble
Saturated
Precipitate
No.2: Many common materials are mixtures.
Question
Which of the following is NOT a mixture?
Answers
Correct Answer
Distilled water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Tap water
Salt water
Sandy water
No.3: How to obtain a sample of salt from rock salt.
Question
Which of the following techniques is NOT involved in obtaining salt from rock salt?
Answers
Correct Answer
Distilling
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Filtering
Dissolving
Evaporating
No.4: Salt has many different uses.
Question
Answers
Which of the following do NOT use salt?
Correct Answer
Printing books
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Making cheese
Making soap
Softening water
Exercise No: 2
Name: Solvents and Solutes
No.5: When a solute dissolves, mass is conserved.
Question
If I dissolve 4 grams of salt in 100 grams of water, what will the total mass of the solution be?
Answers
Correct Answer
104 grams
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
4 grams
100 grams
102 grams
No.6: When a solute dissolves, the solute and solven
Question
When solid particles meet liquid particles they can _______ to form a special mixture called a
solution.
Answers
Correct Answer
mix together
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
separate
join together
change into other particles
No.7: Particle theory can be used to model changes
Question
Put the following sentences in the correct order to describe how a solution is created.
Answers
Correct Order
C-A-E-D-B
Statement A
Statement B
Statement C
Statement D
Statement E
The liquid particles start to bump into the solid particles.
A solution has been created.
When a solid and a liquid are mixed together.
The solid particles spread out evenly between the liquid particles.
This makes the solid particles break apart.
No.8: Solids can dissolve in liquids other than water
Question
Answers
What is the most common solvent in everyday life?
Correct Answer
Water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Petrol
Acetone
Alcohol
Exercise No: 3
Name: Separation Techniques
No.9: Distillation is a process in which evaporation
Question
Which two processes are involved in distillation?
Answers
Correct Answer
Correct Answer
Condensing
Evaporating
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Melting
Freezing
Filtering
No.10: How distillation works.
Question
Answers
Which of the following could not be separated by distillation?
Correct Answer
Iron and sand
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Water and salt
Water and sugar
Water and alcohol
No.11: How to separate and identify materials
Question
If a dye is pure (made up of only 1 colour) how many spots will be produced on the
chromatogram?
Answers
Correct Answer
1
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
2
3
Could be any number
No.12: How scientists use evidence from chromatograph
Question
Which of the following is chromatography NOT used for?
Answers
Correct Answer
To find out if there is metal in sand.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
To find out if there are drugs in blood samples.
To find out what dyes are in food.
To find out if there are pesticides in water.
Exercise No: 4
Name: Making Solutions
No.13: When a solid is added to a liquid, eventually
Question
What is a saturated solution?
Answers
Correct Answer
A solution in which no more solute can be dissolved.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A solution in which more solute can be dissolved.
A gas under pressure.
A solid which can be dissolved in water.
No.14: What is solubility?
Question
Answers
What is meant by 'solubility'?
Correct Answer
The maximum mass of the solute that you can dissolve in a
specified mass of the solvent.
Incorrect Answer 1
The minimum mass of the solute that you can dissolve in a specified
mass of the solvent.
The average mass of the solute that you can dissolve in a specified
mass of the solvent.
The time it takes for 10g of solute to dissolve in 100cm3of water.
Incorrect Answer 2
Incorrect Answer 3
No.15: Many solutes are soluble at high temperatures
Question
If you heat a solution you can dissolve _______ solute in it.
Answers
Correct Answer
more
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
no
less
the same amount of
No.16: Separating mixtures summary.
Question
If you are separating substances that are liquids or are dissolved, which of the following methods
would you definitely NOT use?
Answers
Correct Answer
Filtration.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Chromatography.
Evaporation.
Distillation.
Question
I have made a solution of salt and water. Tell me: 1. Which is the solvent and which is the
solute in this solution? 2. What happened to the salt particles as the solution was made?
and 3. How could I separate the salt from the water again?
Expert
Teacher
Answer
In this solution the water is the solvent and the salt is the solute. When the solution was made, the
water particles bumped into the salt particles and made them separate from each other.
Eventually all the salt particles were separated from each other and they spread out through the
water particles, creating a solution. To separate the salt from the water you could heat up the
solution which would make the water evaporate and this would leave just the salt behind.
KS3 Science Unit 7I: Energy resources
Exercise No: 1
Name: Energy & Fuels
No.1: Energy
Question
Answers
Which TWO of these statements are true about energy?
Correct Answer
Correct Answer
Energy is what makes living things and machines work
Energy is the ability to do things
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Energy is only important in machines
There are just 3 types of energy
Energy is made in factories
No.2: Fuels
Question
Answers
How many different fuels are used in UK power stations?
Correct Answer
3
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
5
8
7
No.3: Testing Fuels
Question
You can compare the energy fuels release by using them to heat test tubes of water. Which of
these is LEAST important if you want to compare fuels fairly?
Answers
Correct Answer
Start the experiments at the same time
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Keep the volume of water constant
Keep the mass of fuel constant
Keep the distance between the tube and fuel constant
No.4: Bunsen Burners
Question
Put these into the correct order to get a Bunsen burner lit safely!
Answers
Correct Order
C-D-A-B-E
Statement A
Statement B
Statement C
Statement D
Statement E
Light the match
Switch the gas tap on
Make sure the Bunsen Burner is in a safe place
Make sure the air hole is closed
Put the match above the Bunsen Burner
Exercise No: 2
Name: Fossil Fuels
No.5: Fossil Fuels
Question
Which of these is the biggest use of fossil fuels today?
Answers
Correct Answer
Burning them to generate electricity.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Burning them at home for warmth.
Finding out about dinosaurs.
Using them as building materials.
No.6: Making Fossil Fuels
Question
Answers
Put these in order to explain how coal is made.
Correct Order
E-A-D-B-C
Statement A
Statement B
Statement C
Statement D
Statement E
The trees died.
Over many years of being crushed, coal is formed.
The coal is dug up for us to burn.
Layers of mud and rock slowly pile up on top of them.
Trees grew in swampy areas.
No.7: Disaster?
Question
What percentage of our electricity will be affected in the United Kingdom if all fossil fuels (coal,
petroleum and gas) run out?
Answers
Correct Answer
about 76%
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
about 24%
0%
100%
No.8: Alternatives
Question
Answers
Which TWO of these are advantages of using renewable fuels?
Correct Answer
Correct Answer
They won't run out
They cause less air pollution
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They are cheaper
They are more reliable
They are easier to set up
Exercise No: 3
Name: Alternatives
No.9: Wind
Question
What kind of areas are likely to be best suited to having wind turbines?
Answers
Correct Answer
Remote, coastal areas
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Areas close to a big city
A nature reserve
People's gardens
No.10: Sunlight
Question
Answers
We can use solar _______ to turn energy from the Sun into electricity.
Correct Answer
cells
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
furnaces
panels
heaters
No.11: Waves
Question
What are the advantages of vehicles using wave power?
Answers
Correct Answer
All of these
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Waves are a renewable energy resource
There are no exhaust fumes
There is no air pollution
No.12: Other Alternatives
Question
Which TWO of these are NOT examples of biomass?
Answers
Correct Answer
Correct Answer
Sunlight
Coal
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Wood chips
Leftover crops
Rotting rubbish
Exercise No: 4
Name: Not just electricity
No.13: Energy for Us
Question
Answers
Correct Answer
We burn energy whatever we are doing.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
We don't burn energy unless we exercise.
If I eat very little I will have lots of energy.
We should eat as much as we can so that we have enough energy.
No.14: Measuring Energy
Question
Answers
Scientists usually use a modern unit called the _______ to measure energy.
Correct Answer
joule
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
jewel
kilocalorie
heat
No.15: Plants
Question
Which TWO of these does a plant NOT need for photosynthesis?
Answers
Correct Answer
Correct Answer
Glucose
Soil
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Sunlight
Carbon dioxide
Water
No.16: The Source
Question
Which of these sources of energy is not mentioned as relying on the Sun?
Answers
Correct Answer
Nuclear energy.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Fossil fuels.
Food.
Wind power.
Question
Explain why the Sun is so important to life on Earth.
Expert
Teacher
Answer
As well as giving us heat and light, the Sun provides the energy for plants to photosynthesise,
which in turn give animals and plants their energy for activities and growth. The Sun provided the
energy for plants and animals many year ago which we now use when we burn fossil fuels to
generate most of our electricity. Although fossil fuels will one day run out, many of the alternatives
(wind, solar power, hydroelectric, biomass) also rely on energy from the Sun.
KS3 Science Unit 7J: Electrical circuits
Exercise No: 1
Name: Circuits
No.1: Circuits
Question
Four students wrote about switches for their homework. Which of them needs more help with this
topic?
Answers
Correct Answer
Sally: A switch will only stop the bulb lighting if you put it near
the minus end of the battery.
Incorrect Answer 1
Incorrect Answer 2
Darren: A switch is like a break in the circuit, until you turn it on.
Sinead: A switch has to be connected in series with a battery and a
bulb.
Amede: When you press a switch it closes a gap in the circuit.
Incorrect Answer 3
No.2: Using symbols
Question
Answers
Why do we use symbols to draw circuits rather than pictures?
Correct Answer
All of these answers are right.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
There are standard symbols for everything in a circuit.
It takes too long to draw pictures.
People draw different pictures for the same thing.
No.3: Drawing circuits
Question
Answers
What does the symbol of a cross inside a circle represent?
Correct Answer
A bulb.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A battery.
A switch.
A broken bulb.
No.4: Cells
Question
Which of these ideas is WRONG?
Answers
Correct Answer
Batteries contain electric currents. They send them to light bulbs
to make them light up.
Incorrect Answer 1
Incorrect Answer 2
Electric currents go all the way round a circuit.
Batteries give electrons energy and bulbs transfer that energy to heat
and light.
An electric current forms when the electrons in a wire start to move
because there is a battery in the circuit.
Incorrect Answer 3
Exercise No: 2
Name: Components
No.5: Electric current
Question
When a circuit contains very long wires:
Answers
Correct Answer
The bulb still comes on as soon as the switch is pressed because
all the electrons in a circuit move at once.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The current can get used up before it reaches the bulb.
The current drops before it gets back to the battery or cell.
There is a slight delay before the current gets to the bulb.
No.6: Changing currents
Question
Answers
Four students described their experiments. Which one got an odd result?
Correct Answer
When we put an extra cell in our circuit the current went up but
the lamp did not change.
Incorrect Answer 1
The current leaving the cells was the same as the current returning to
them, however many cells we had.
The bulbs got brighter when we put extra cells in our circuit.
When we put two cells in the circuit the current was twice as big.
Incorrect Answer 2
Incorrect Answer 3
No.7: Resistance
Question
The wires in a circuit have a very low resistance, but components like bulbs can have a higher
resistance. Which of these results is wrong?
Answers
Correct Answer
An electric current can be high in the wires but it gets cut down
when it reaches a light bulb.
Incorrect Answer 1
A larger current will flow if there are no components to provide
resistance.
Every bulb you add to a circuit increases its resistance and reduces
the current.
If a circuit has a higher resistance it takes more cells to push a current
through it.
Incorrect Answer 2
Incorrect Answer 3
No.8: Measuring current
Question
Answers
When you add extra bulbs to a series circuit:
Correct Answer
the current drops and each bulb transfers less energy to light.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the current increases.
the bulbs get brighter.
the resistance goes down.
Exercise No: 3
Name: Series and Parallel
No.9: Fuses
Question
Which of the following is NOT true?
Answers
Correct Answer
Fuses are like switches.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
When a fuse melts it cuts off a circuit.
Fuses are safety devices.
Fuse wire melts if the current through it gets too high.
No.10: Adding components
Question
Answers
When you add a cell to a series circuit:
Correct Answer
the bulbs get brighter.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the cells cancel each other out.
the cells run down quicker.
the bulbs get dimmer.
No.11: Series and parallel
Question
Are a car headlights wired in series or parallel?
Answers
Correct Answer
Parallel, because if one goes out, the other stays on.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Parallel, because they are both bright.
Series, because they both come on at once.
Series, because if the fuse blows, they both go out.
No.12: In parallel
Question
A current of 2 amps flows through both lamps in a parallel circuit. The current leaving the battery
must be:
Answers
Correct Answer
4 amps.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
2 amps.
1 amp.
It depends on the number of cells.
Exercise No: 4
Name: Review
No.13: History and electricity
Question
The first of these to be invented was the:
Answers
Correct Answer
battery.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
light bulb.
voltmeter.
powerpack.
No.14: Generating Voltage
Question
Answers
A cell's voltage comes from:
Correct Answer
a chemical reaction.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
electrons in the battery.
acid.
two identical pieces of metal.
No.15: Safety and electricity
Question
Which of the following statements is not true?
Answers
Correct Answer
The wires in a toaster are all insulated with plastic.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Toasters use electricity to make wires hot enough to glow.
A metal fork is a good conductor.
Mains voltage can kill.
No.16: Reviewing
Question
Which of the following would increase the current in a series circuit?
Answers
Correct Answer
Using fewer bulbs.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Using an older cell.
Making the wires longer.
Taking out a cell.
Question
Why does a bulb light up?
Expert
Teacher
Answer
For a circuit to work, it must have a cell (battery), a bulb, and they have to be connected in a
complete circuit with no gaps. The cell pushes electrons out of one end, they go through the
conducting wires to the bulb, use up their energy, and back to the other end of the cell to get
some more energy. The bulb converts the electrical energy into heat and light, because the
filament inside it gets so hot.
KS3 Science Unit 7K: Forces and their
effects
Exercise No: 1
Name: Different forces
No.1: 1. Facts about forces
Question
In her homework, Sophie said that a force can change the speed, direction or shape of an object.
How many of the things she mentioned are true?
Answers
Correct Answer
All 3
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
None of them
1 of them
2 of them
No.2: 2. Forcemeters
Question
Choose 2 correct endings for this sentence: Forces are measured.....
Answers
Correct Answer
Correct Answer
.....with a forcemeter.
....in Newtons (N for short).
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
.....with a metre rule.
.....in grams or kilograms.
.....in opposite directions.
No.3: 3. Gravity
Question
Which of these is true about gravity:
Answers
Correct Answer
It attracts things towards the centre of the Earth.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Gravity is just as strong on the moon as it is on Earth.
Gravity pushes things upwards in Australia.
Only big things like the Earth have gravity.
No.4: 4. Balancing forces
Question
A car is being pushed but it won't move. The best explanation is: The pushing force can not be
made _______ the force opposing motion.
Answers
Correct Answer
greater than
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
opposite to
equal to
less than
KS3 Science Unit 7K: Forces and their effects
Exercise No: 2
Name: Floating
No.5: 5. Upthrust
Question
The upthrust on a object can be measured by:
Answers
Correct Answer
Seeing how much a forcemeter reading drops when an object is
lowered into water.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Seeing happens when more water is added.
Weighing the object under water.
Weighing the object in air.
No.6: 6. Why objects float
Question
Answers
Five students wrote about why things float. Which two gave the best answers?
Correct Answer
Correct Answer
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Eniola: Things float when their density is less than 1 g/cm3 which
is the density of water.
Amede: Things float when the upthrust on them exactly balances
their weight.
Kerry: Nothing heavy will float unless it is made into the shape of a
boat.
Tom: Only light things will float.
Alice: Only things with air inside them will float.
No.7: 7. Coke cans
Question
Answers
Four students wrote about why the diet Coke floats better. Which student got the answer wrong?
Correct Answer
Darren: The diet Coke floats better because it has more air in the
can.
Incorrect Answer 1
Karmela: Each cubic centimetre of the diet Coke weighs less than the
ordinary Coke does.
Andrew: The two cans have the same volume but the diet Coke has
less mass.
Kasia: The diet Coke floats better because it has a lower density.
Incorrect Answer 2
Incorrect Answer 3
No.8: 8. Sinking ships
Question
If the water gets denser because it is colder or saltier a ship will
Answers
Correct Answer
float higher
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sink lower
lose upthrust
lose weight
Exercise No: 3
Name: Mass and weight
No.9: 9. Mass and weight
Question
Answers
Correct Answer
Your weight drops when you go into space.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Weight is measured in kilograms and mass in Newtons.
Your mass goes down when you go into space.
Weight and mass are the same thing.
No.10: 10. Changing weights
Question
Jupiter has more mass than Earth so its gravity is stronger. How would that affect your weight if
you went there?
Answers
Correct Answer
Your weight would increase.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
You would be a long way from Earth so you would lose weight.
Your weight would be pulled down more.
Your weight would stay the same but your mass would increase.
No.11: 11. Earth's gravity
Question
Earth's gravity gives everything a weight of 10 Newtons per kilogram, on the surface of the planet.
How much would a Year 7 student with a mass of 40 kg weigh on Earth?
Answers
Correct Answer
400 Newtons
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
4 Newtons
40 Newtons
40 Kg - mass never changes
No.12: 12. Stretching a spring
Question
When a mass is hung on a spring, the extra weight makes it stretch. 100g makes the spring 2cm
longer. How long will it get when 300g are added?
Answers
Correct Answer
6 cm
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
8 cm
2 cm
4 cm
Exercise No: 4
Name: Friction
No.13: 13. Friction
Question
Which source of friction is useful?
Answers
Correct Answer
The friction between shoes and the floor.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The water resistance pushing against a Channel Ferry.
The friction between a wheel and the axle it turns on.
The air resistance pushing against a cyclist.
No.14: 14. Slowing down
Question
Answers
Which 2 of these reduce friction?
Correct Answer
Correct Answer
Putting oil on a bicycle chain.
Getting water on a tiled floor.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Putting sand on ice to make the surfaces rougher.
Getting new tyres with a deeper tread.
Replacing worn out brake pads.
No.15: 15. Speed graphs
Question
Suppose you have distance-time graphs for two cars. You can tell which is the fastest car
because:
Answers
Correct Answer
it will have the steepest line.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it will have a bend in the middle.
it will start nearer the top of the graph.
it will be completely flat.
No.16: 16. Stopping
Question
Which of the following will increase the stopping distance?
Answers
Correct Answer
Reduced friction on a wet, slippery road.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
New brake pads.
New tyres with a deeper tread.
Driving at a slower speed.
Question
How can you tell if the forces on an object are balanced? Give some examples of forces
that can balance each other. Then explain what would happen if one of each pair
increased.
Expert
Teacher
Answer
It will stay still, or continue to travel at a steady speed in a straight line, and its shape will not
change. Weight can be balanced by upthrust, the reaction of the floor or tension in a spring. If the
weight is increased, the other forces would have to increase as well. The upthrust on a boat
increases if it sinks lower in the water. The thrust of a car engine can be balanced by friction and
air resistance. If the friction gets bigger, the car slows down.
KS3 Science Unit 7L: The solar system
and beyond
Exercise No: 1
Name: Time and seasons
No.1: Earth view
Question
Answers
Why do we have day and night?
Correct Answer
Because the Earth spins on its axis.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Because the sun orbits the Earth.
Because the moon orbits the Earth.
Because the Earth orbits the sun.
No.2: Day and night
Question
Which of these statements is INCORRECT?
Answers
Correct Answer
I live in England where the sun rises in the west and sets in the
east.
Incorrect Answer 1
At any time, one half of the earth faces the sun and experiences
daylight, while the other half is in darkness.
The apparent daily movement of the sun is due to the earth's rotation.
I live in Australia where the sun rises in east and sets in the west.
Incorrect Answer 2
Incorrect Answer 3
No.3: Seasons
Question
Answers
What is the main reason why we have seasons?
Correct Answer
Because the Earth is tilted.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Because the Earth orbits the sun.
Because the Earth rotates about its axis.
Because the Sun orbits the Earth.
No.4: More about seasons
Question
Which of these statements is NOT true?
Answers
Correct Answer
Sometimes the Earth is farther from the Sun and sometimes it is
closer
Incorrect Answer 1
Incorrect Answer 2
The Earth travels around the Sun in an almost perfect circle.
Sometimes the sun's rays hit us directly, sometimes they are spread
more thinly.
We sometimes spend a longer time in the Sun, sometimes a shorter
time.
Incorrect Answer 3
KS3 Science Unit 7L: The solar system and beyond
Exercise No: 2
Name: Sun and Moon
No.5: Satellites
Question
The moon appears to change shape when:
Answers
Correct Answer
different areas of its surface reflect sunlight towards Earth
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it turns away from the Earth.
the Earth casts a shadow on it.
clouds block the moonlight.
No.6: The Moon
Question
Answers
Which of the following statements is correct?
Correct Answer
Neither the Moon nor the Earth produce their own light.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The Earth and the Moon produce their own light.
The Moon produces its own light, but the Earth doesn't.
The Earth produces its own light, but the Moon doesn't.
No.7: Eclipse
Question
Which of these statements is incorrect?
Answers
Correct Answer
During a solar eclipse, the Earth passes between the Sun and the
Moon,
Incorrect Answer 1
During a lunar eclipse, the Earth passes between the Sun and the
Moon,
An eclipse occurs when the Sun, the Moon and the Earth all line up
Totality is when the sky goes dark as if it were night during a solar
eclipse
Incorrect Answer 2
Incorrect Answer 3
No.8: What can eclipses tell us?
Question
Answers
What do scientists use eclipses for?
Correct Answer
All of these.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
To measure the Sun's dimensions.
To study the chromosphere, prominences, and the corona.
To research animal behaviour.
Exercise No: 3
Name: Our Solar System
No.9: Our solar system
Question
Which of these is NOT part of our solar system?
Answers
Correct Answer
The north star
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Pluto
Asteroid belt
Sun
No.10: How big and how far?
Question
Answers
Which planet is closest to the sun?
Correct Answer
Mercury
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Pluto
Neptune
Venus
No.11: Planet facts
Question
Here are 5 of the nine planets. Put them in order of surface temperature from hottest to coldest.
Answers
Correct Order
E-A-B-D-C
Statement A
Statement B
Statement C
Statement D
Statement E
Mars
Jupiter
Neptune
Uranus
Venus
No.12: Is there life out there?
Question
Answers
Which of the following in our solar system are known to support life?
Correct Answer
Earth.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Earth and Mars.
Earth and Titan.
Earth and Europa.
Exercise No: 4
Name: Beyond our solar system
No.13: Planet or star?
Question
Which of the following was NOT formed by particles of dust and gas sticking together?
Answers
Correct Answer
Sun
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mars
Neptune
Mercury
No.14: Star gazing
Question
Answers
Which of these statements is NOT correct?
Correct Answer
The stars are in different positions because they orbit the Earth
Incorrect Answer 1
We do not see the stars during the day because the Sun's light is too
strong
The stars appear to change position because of the Earth's rotation.
We can see the Sun and other stars because they are light sources.
Incorrect Answer 2
Incorrect Answer 3
No.15: Galaxies and the Universe
Question
Answers
Where are the stars in space?
Correct Answer
Throughout the Universe.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Only in our solar system
Only in the Milky Way
Only in Andromeda
No.16: Andromeda
Question
A galaxy is:
Answers
Correct Answer
A vast collection of stars.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A type of solar system.
A spiral of glowing gas.
Another name for the universe.
Question
Explain why Earth depends on the Sun and how the other planets are affected by the Sun.
Expert
Teacher
Answer
The pull of gravity from the Sun holds our solar system together, so that all the planets orbit the
Sun. The Sun is a star, so it gives out heat and is our light source. The Earth?s axis is tilted, so as
it orbits the Sun, we get the different seasons. As the Earth rotates on its axis, we get night and
day. Altogether there are nine planets in our solar system. The further away the planet is from the
sun, the larger its orbit time around the sun, and the colder it is. Mars is a lot colder than Earth,
followed by Jupiter, Saturn, Uranus, each getting colder, until you get to Neptune and Pluto which
are the coldest planets.
KS3 Science Unit 8A: Food and
digestion
Exercise No: 1
Name: Food and Nutrients
No.1: Nutrients
Question
Answers
Four students wrote about balanced diets for homework. Who got the answer wrong?
Correct Answer
Amede: A balanced diet contains equal amounts of proteins, fats,
carbohydrates, vitamins and minerals.
Incorrect Answer 1
Mary: A balanced diet provides enough carbohydrate, fat, protein,
vitamins, and minerals to supply the energy and raw materials you
need.
Natasha: A balanced diet contains enough vitamins and minerals for
good health, fats and carbohydrates for energy, and proteins for
growth and repair.
Mark: A balanced diet contains enough cereals, bread or pasta for
energy, fruit and vegetables for good health, and meat, nuts or dairy
products for growth and repair.
Incorrect Answer 2
Incorrect Answer 3
No.2: Foods
Question
Some people worry about not getting enough vitamins and minerals in their diet. What should
they eat more of?
Answers
Correct Answer
Fruit, vegetables and dairy products.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Fats and carbohydrates.
Protein and fat.
Meat and fish.
No.3: Vitamins & minerals
Question
Answers
Which of these statements are true?
Correct Answer
Calcium is needed for strong bones and iron for red blood cells.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Too much iron makes you anaemic.
Calcium stops you becoming anaemic.
Calcium and iron make bones stronger.
No.4: Testing food
Question
A food turns purple in the Biuret test. What does this tell you?
Answers
Correct Answer
The food has some protein in it.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The test has worked.
The food does not contain starch or sugar.
The food is pure protein.
KS3 Science Unit 8A: Food and digestion
Exercise No: 2
Name: Digestion
No.5: Digestion
Question
Four students wrote about digestion for their homework. Which student needs most help with this
topic?
Answers
Correct Answer
Carol: Digestion separates all the goodness out of food so that
your body can use it.
Incorrect Answer 1
Karis: Food can only be absorbed by your body if it is made of small
molecules. Digestion uses enzymes to make food molecules smaller.
Avnita: Most food molecules are too big to pass through the gut wall
into the blood. They have to be broken down by enzymes first. This is
digestion.
Sam: Digestion breaks large insoluble food molecules into small
soluble ones.
Incorrect Answer 2
Incorrect Answer 3
No.6: Enzymes
Question
Answers
Name the part of the gut where most digestion takes place.
Correct Answer
Small intestine
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mouth
Large intestine
Stomach
No.7: The gut
Question
Answers
Where do nutrients go when they leave the small intestine?
Correct Answer
Into the bloodstream
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Into the stomach
Into the rectum
Into the large intestine
No.8: Digested food
Question
Glucose provides instant energy. _______ so it does not need to be digested.
Answers
Correct Answer
Its molecules are small already
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It does not need to get into the blood
It is usually dissolved in energy drinks
It is not an important nutrient
Exercise No: 3
Name: Experiments
No.9: The model gut
Question
The water outside a model gut was tested for sugar and starch. Sugar was detected but not
starch. Why was this?
Answers
Correct Answer
The holes in the dialysis tubing let glucose through but starch is
too big.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The starch test was not working properly.
The model gut was not left long enough before it was tested.
Starch breaks down into glucose, so it does not show up.
No.10: Breakdown
Question
Answers
What happens to starch when it is digested?
Correct Answer
It is converted to glucose.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It breaks down into amino acids.
It releases energy.
It breaks down into smaller starch molecules.
No.11: Amylase
Question
Starch and amylase were placed in a model gut. Glucose was detected in the water around it
after 30 minutes. Which of the following is WRONG?
Answers
Correct Answer
Amylase breaks down into glucose molecules.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Amylase converts starch to glucose.
Amylase is an enzyme.
Amylase speeds up the breakdown of starch.
No.12: Changing temperatures
Question
A mixture of starch and amylase left at 37 degrees took 17 minutes to digest. A mixture left at 0
degrees took more than 30 minutes. What can you conclude?
Answers
Correct Answer
Amylase breaks starch down faster at 37 degrees than it does at 0
degrees.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
All enzymes are affected by the temperature.
Starch breaks down when it is warmed up.
Amylase works best at 37 degrees.
Exercise No: 4
Name: Enzymes and Absorption
No.13: Different foods, different enzymes
Question
In the large intestine (colon) _______ and faeces is produced.
Answers
Correct Answer
water is removed from food like fibre that will not digest
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
vitamins and minerals are absorbed
vitamins and minerals are digested
fibre is digested
No.14: An enzyme at work
Question
Answers
Why might each type of food need a different enzyme to digest it?
Correct Answer
The enzyme has to be the right shape to fit the food molecules.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The enzyme has to be made in the right part of the gut.
Different enzymes work best at different pH values.
Different enzymes work best at different temperatures.
No.15: Review
Question
Once they get into the bloodstream, small molecules like glucose are:
Answers
Correct Answer
taken to every cell.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
stored in red blood cells.
turned back into starch.
used to keep the blood healthy.
No.16: Food factory
Question
Which TWO of the following do NOT produce enzymes?
Answers
Correct Answer
Correct Answer
Oesophagus.
Large intestine.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mouth.
Small intestine.
Stomach.
Question
Starch is an important energy source. Explain why you have to digest the molecule before
you can use its energy, and how it is digested.
Expert
Teacher
Answer
The foods we use for energy and raw materials are carried to every cell by the blood. The
molecules in starch are too big to get through the gut wall into the bloodstream. They need to be
broken down into small molecules of glucose by enzymes. One of the enzymes that breaks down
starch is amylase, which is found in saliva. In the small intestine, the glucose is absorbed into the
blood so it can be carried to every cell and used to release energy.
KS3 Science Unit 8B: Respiration
Exercise No: 1
Name: Getting energy
No.1: Food 2
Question
Answers
We use food for all but one of the following. Pick out the statement that is NOT true.
Correct Answer
To provide the oxygen needed for respiration.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Keeping the life processes in cells going.
Building new cells for growth and repair.
Releasing heat energy to keep us warm.
No.2: Using food
Question
Energy is not usually included in the equation for respiration because it is not a chemical. The
correct word equation is:
Answers
Correct Answer
glucose + oxygen -> water + carbon dioxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
glucose + carbon dioxide -> oxygen + water
oxygen + carbon dioxide -> glucose + water
water + oxygen -> carbon dioxide + glucose
No.3: Energy release
Question
Pick TWO ways in which the reactions in cells are different from burning:
Answers
Correct Answer
Correct Answer
The release of energy in the cell is controlled.
The energy is not all released as heat in a cell.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The water produced in a cell is turned to steam.
Cells convert glucose and oxygen to carbon dioxide and water.
The reactions in cells need more oxygen.
No.4: Getting food to cells
Question
Which of these sentences is WRONG.
Answers
Correct Answer
Cells take in blood to give them glucose for energy.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Glucose enters the blood when carbohydrates are digested.
The blood carries glucose to every cell.
Cell membranes let glucose into cells to supply energy.
Exercise No: 2
Name: Delivering glucose and oxygen
No.5: Circulation
Question
To get to the leg muscles, glucose from the small intestine has to take a trip around the body. The
route is:
Answers
Correct Answer
small intestine -> heart -> lung -> heart -> leg muscle
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
small intestine -> lung -> heart -> leg muscle
small intestine -> heart -> leg muscle
small intestine -> heart -> lung -> leg muscle
No.6: Pumping blood
Question
Answers
The heart is like 2 pumps joined together because:
Correct Answer
One side pumps blood to the lungs. The other sends it to the rest
of the body.
Incorrect Answer 1
One side pumps blood to the top of the body and the other side sends
it to the bottom.
One side sends blood to the left and the other sends it to the right.
One side pumps blood and the other pumps water and dissolved food.
Incorrect Answer 2
Incorrect Answer 3
No.7: Removing waste
Question
Answers
How is most of the carbon dioxide in the blood carried?
Correct Answer
Dissolved in the plasma.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
As a gas.
In red blood cells.
Stuck to the outside of red blood cells.
No.8: Odd ideas
Question
Galen was a Greek scientist who lived nearly 2000 years ago. These are his ideas about
circulation. Which of Galens ideas are known to be true?
Answers
Correct Answer
Blood passes through the heart.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The heart sucks blood from the veins.
There are two different sorts of blood.
Blood is consumed by the organs.
Exercise No: 3
Name: Taking in oxygen
No.9: Gas exchange
Question
Which of these happen in the alveoli?
Answers
Correct Answer
Correct Answer
Some of the oxygen in the air moves into the red blood cells.
Some of the carbon dioxide in the blood plasma moves into the
air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The red blood cells take all the oxygen out of the air.
Red blood cells release carbon dioxide into the air.
The blood replaces all its carbon dioxide with oxygen.
No.10: Alveoli
Question
The lungs are filled with tiny alveoli to give it a large _______ for gas exchange.
Answers
Correct Answer
surface area
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
air supply
volume
blood supply
No.11: Lung damage
Question
People with emphysema feel short of breath because the _______ used for gas exchange is
reduced.
Answers
Correct Answer
surface area
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
oxygen
blood supply
air
No.12: In and Out
Question
Answers
The air we breath out contains:
Correct Answer
less oxygen but more carbon dioxide and water vapour.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
more of every gas except nitrogen.
less oxygen and water vapour but more carbon dioxide.
less oxygen and carbon dioxide but more water vapour.
Exercise No: 4
Name: Other organisms
No.13: Plant respiration
Question
Plant cells respire and release carbon dioxide:
Answers
Correct Answer
all the time.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
only when photosynthesis is taking place.
only when it is dark.
only when it is light.
No.14: Measuring respiration
Question
Answers
Which one the following is true?
Correct Answer
In the dark, plants produce extra carbon dioxide.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Plants always need carbon dioxide for photosynthesis.
In the dark, plants use up carbon dioxide.
Plants produce extra carbon dioxide in the light.
No.15: Warming up
Question
When live peas are kept in a vacuum flask for a few days their temperature goes up. What is the
best explanation for this?
Answers
Correct Answer
The temperature goes up because the seeds are respiring.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The temperature goes up because bacteria grow on the peas.
The temperature goes up because vacuum flasks keep things warm.
The temperature goes up because the peas are boiled.
No.16: Being energetic
Question
The relationship between running speed and respiration rate is:
Answers
Correct Answer
The faster the running speed the higher the respiration rate.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Dogs are slow and kangeroos are fast.
Dogs can run as fast as kangeroos but their respiration rate is lower.
Respiration only occurs when animals are running.
Question
Describe and explain what happens to your heart rate and breathing rate when you start
running?
Expert
Teacher
Answer
Your heart rate and breathing rate both increase. Muscle cells need to respire faster when you
run so that they can release more energy for movement. The equation for respiration is glucose +
oxygen -> carbon dioxide + water, so cells need more oxygen and glucose, and more carbon
dioxide has to be removed. The increased breathing rate speeds up gas exchange in the lungs.
The increased heart rate speeds up the delivery of oxygen and glucose to the cells, and the
removal of carbon dioxide.
KS3 Science Unit 8C: Microbes and
disease
Exercise No: 1
Name: What are Microbes?
No.1: Classifying microbes
Question
Answers
Which is the smallest type of microbe?
Correct Answer
virus
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
protozoan
fungus
bacteria
No.2: Useful Microbes
Question
Microbes release the gas called _______ to make our bread rise.
Answers
Correct Answer
carbon dioxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
oxygen
hydrogen
nitrogen
No.3: Yeast
Question
Yeast is a type of:
Answers
Correct Answer
fungus
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
bacteria
protozoan
virus
No.4: Bacteria
Question
Answers
Which 4 parts do most bacteria contain?
Correct Answer
cell wall, membrane, DNA, cytoplasm
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
cell wall, membrane, nucleus, cytoplasm
membrane, DNA, cytoplasm, chlorophyll
membrane, nucleus, cytoplasm, chlorophyll
KS3 Science Unit 8C: Microbes and disease
Exercise No: 2
Name: Can microbes be harmful?
No.5: Diseases caused by microbes
Question
Can you name three diseases caused by bacteria?
Answers
Correct Answer
T.B., Salmonella, Whooping Cough
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mumps, Polio, Smallpox
HIV, Influenza, Measles
Athlete's foot, Chickenpox, Cold
No.6: Epidemics
Question
Answers
What nursery rhyme refers to the plague?
Correct Answer
Ring a ring o' roses
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Grand Old Duke of York
Humpty Dumpty
Little Bo Peep
No.7: Smallpox wipeout
Question
Which of the following is an example of microbes entering the body through our food?
Answers
Correct Answer
Salmonella.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Colds and flu.
Tetanus.
Rubella.
No.8: Famous Scientists
Question
What protective properties did Edward Jenner discover about cowpox?
Answers
Correct Answer
It protects against smallpox.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It protects against chickenpox.
It protects against measles.
It protects against the plague.
Exercise No: 3
Name: Can we protect ourselves against diseases?
No.9: How microbes enter the body
Question
Many harmful microbes can pass from one person to another. Which of the following is the most
likely way you could catch chickenpox?
Answers
Correct Answer
From the air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Through touch.
Through contaminated food.
From drinking water.
No.10: How our bodies fight disease.
Question
Answers
Why do microbes not survive in our stomach?
Correct Answer
They are killed by stomach acid.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They are killed by the food in the stomach.
They are killed by the churning action of the stomach.
They are killed by the enzymes in the stomach
No.11: Antibodies
Question
Which type of cells in our bodies can engulf bacteria or make antibodies?
Answers
Correct Answer
White blood cells
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Red blood cells.
Platelets.
Sticky mucus.
No.12: Antibiotics
Question
What was the name of the first antibiotic?
Answers
Correct Answer
Penicillin
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Paracetamol
Aspirin
Ibuprofen
Exercise No: 4
Name: Are we healthier than our grandparents?
No.13: Methods used to prevent infection
Question
In what conditions do bacteria and fungus grow best?
Answers
Correct Answer
Dark, warm, damp conditions.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Dark, cold, damp conditons.
Dark, cold, dry conditions.
Light, warm, damp conditions.
No.14: Vaccination
Question
Answers
What do vaccines contain that protects us from disease?
Correct Answer
Dead or weakened microbes
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Live untreated microbes
Antibiotics
Antiseptics
No.15: To vaccinate or not?
Question
What do the letters MMR stand for?
Answers
Correct Answer
Measles, mumps, rubella.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Migrane, mumps, rubella.
Measles, migrane, rubella.
Measles, mumps, rickets.
No.16: Major childhood diseases
Question
Which of the following fines were NOT used to try to control smallpox?
Answers
Correct Answer
Fining people if they used public places or vehicles when they
had suffered from smallpox and recovered, but didn’t tell the
owners.
Incorrect Answer 1
Fining people if they were the owners and didn’t disinfect public places
and vehicles when they knew they had been used by infected people.
Fining people if they used public places or vehicles if they knew they
were infected and didn’t tell the owners.
Fining people if they didn’t have their children vaccinated before they
were three months old.
Incorrect Answer 2
Incorrect Answer 3
Question
How have we become healthier than our great-grandparents?
Expert
Teacher
Answer
Edward Jenner was the first of many in our history to discover a vaccine against disease.
Scientists then discovered the existence of microbes. Different diseases were found to be caused
by different microbes. Man discovered how our blood cells react to destroy microbes in our body
and many new vaccines were found to deal with different diseases. There is still some debate
over the value of different vaccines, such as MMR. New vaccines are being discovered to deal
with new diseases such as HIV. Antibiotics were first used during World War II and these were
very useful initially. Today some antibiotics are not working so well because the microbes are
constantly mutating and changing. This has given rise to MRSA, microbes that can be found in
some hospitals and these have been called 'superbugs' because they are so difficult to destroy.
Overall we are now much more healthy than our great-grandparents and child mortality rates due
to disease have fallen dramatically.
KS3 Science Unit 8D: Ecological
relationships
Exercise No: 1
Name: A place to live
No.1: Habitats
Question
Answers
A habitat must provide an animal with:
Correct Answer
food, water, shelter and a suitable climate.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
soil, light and water.
food, water and predators.
minerals, sunlight, water and space.
No.2: Differences
Question
Which of the following is an adaptation to desert life?
Answers
Correct Answer
Burrowing underneath the sand during the day.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Having black skin or fur.
Producing very dilute urine.
Hunting for food at midday.
No.3: Adaptations
Question
Which of the following is NOT an adaptation to desert life?
Answers
Correct Answer
Thin leaves.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Long roots.
Spiny leaves.
A stem that stores water.
No.4: Fast Growers
Question
Answers
Bluebells flower early in the spring so that:
Correct Answer
they can produce seeds before the trees block out the light.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
they can get enough water before the hot summer.
they do not get eaten by herbivores.
they do not dry up in the hot summer sun.
KS3 Science Unit 8D: Ecological relationships
Exercise No: 2
Name: Classification 2
No.5: Animals
Question
Which of the following groups contains 3 vertebrates?
Answers
Correct Answer
Snake, turtle, salmon.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Human, lobster, blackbird.
Lizard, frog, squid.
Monkey, starfish, crocodile.
No.6: Invertebrates 2
Question
Answers
Spiders are arthropods. All arthropods have:
Correct Answer
jointed legs.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
six legs and 2 eyes.
bodies divided into 5 sections.
antenae.
No.7: Plants 3
Question
Seeds are made by:
Answers
Correct Answer
flowering plants and conifers.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
all plants.
all vascular plants.
all plants except mosses.
No.8: Mosses
Question
Mosses are more common in areas that are:
Answers
Correct Answer
very damp.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
very brightly lit.
very hot.
close to town centres.
Exercise No: 3
Name: Sampling populations
No.9: Quadrats
Question
Quadrats can be used to estimate the plant populations in large areas. How can you increase the
reliability of your results?
Answers
Correct Answer
Put the quadrat in more places and use the average result.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Use a smaller quadrat.
Make sure you never count the plants at the edge of the quadrat.
Make sure you put the quadrat where most plants are growing.
No.10: Reliable sampling
Question
Answers
It is best to continue taking samples with a quadrat until:
Correct Answer
the biodiversity in your sample areas has stopped increasing.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
you have at least 10 results.
you have counted more than 100 plants.
you have counted 10 different sorts of plants.
No.11: Counting animals
Question
Which piece of equipment allows you to suck up invertebrates without getting them in your
mouth?
Answers
Correct Answer
a pooter.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a funnel.
a sucker.
a straw.
No.12: Populatons
Question
Which of these would NOT decrease a population of animals?
Answers
Correct Answer
A warm spring makes more plants grow.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Some animals catch a fatal disease.
A predator moves into the area.
Fewer animals produce offspring.
Exercise No: 4
Name: Interactions
No.13: Food Webs 2
Question
Consumers are:
Answers
Correct Answer
animals that eat other organisms.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
plants that make their own food.
plants that start the food chain.
animals that eat meat.
No.14: Pyramids
Question
Which of the following food chains would have a 'pyramid' of numbers that was narrower at the
bottom?
Answers
Correct Answer
oak tree -> caterpillar -> bird
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
grass -> rabbit -> fox
lettuce -> slug -> bird
corn -> mouse -> cat -> flea
No.15: Energy flow
Question
An area of grassland can support more rabbits than foxes because:
Answers
Correct Answer
the rabbit only stores a small percentage of the grass's energy in
its body to pass on to the foxes.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
foxes prefer wooded areas.
energy is gained at each step in the food chain.
rabbits store all the energy that was in the grass.
No.16: Interdependence
Question
A new cheetah moves into an area. What difference does it make to the number of antelopes?
Answers
Correct Answer
It goes down due to increased predation.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It goes up to provide an increased supply of food.
It does not change because cheetah share what they catch.
It goes up because more antelopes breed.
Question
Genetically modified foods promise higher yields but it is feared they will reduce the
variety of wild plants and invertebrates found on farms. Why would this have a 'knock-on'
effect on vertebrates and how could you find out if the fears are justified?
Expert
Teacher
Answer
All living things are part of food webs. When one population changes others are always affected
e.g. insect-eating bird populations would fall if there were fewer invertebrates for them to eat. To
be sure, you should grow a GM crop, and an ordinary crop of the same plant, in fields with the
same physical environmental factors. Then use quadrats, pooters etc to sample the wild plants
and invertebrates in each field.
KS3 Science Unit 8E: Atoms and
elements
Exercise No: 1
Name: 1. Elementary my dear Watson!
No.1: 1. What are elements?
Question
Answers
Elements _______ into any simpler substance.
Correct Answer
are pure substances that cannot be broken down
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
are compounds that cannot be broken down
are pure substances that can be broken down
can be broken down into compounds and not
No.2: 2. What are atoms?
Question
What are the smallest particles of matter called?
Answers
Correct Answer
Atoms.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Molecules.
Carrots.
Elements.
No.3: 3. Elements and symbols (a)
Question
Which of the following gives the symbols for hydrogen, carbon, magnesium and argon, in the
correct order?
Answers
Correct Answer
H, C, Mg, Ar
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
H, Ca, Mg, Ar
H, C, Ma, Ar
H ,C, Mg, Ag
No.4: 4. Elements and symbols (b)
Question
The symbol for copper is _______ and this element is used to make electrical wires and cooking
pans.
Answers
Correct Answer
Cu
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
C
Cl
Co
KS3 Science Unit 8E: Atoms and elements
Exercise No: 2
Name: 2. Periodically speaking!
No.5: 5. Periodic Table 1
Question
There are approximately _______ elements.
Answers
Correct Answer
100
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
200
150
50
No.6: 6. Periodic Table 2
Question
Answers
What are the names given first to the horizontal rows and then the vertical columns in the table?
Correct Answer
Periods and groups.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Groups and periods.
Columns and groups.
Periods and rows.
No.7: 7. Where are the metals?
Question
In which TWO places on the periodic table would you find metals?
Answers
Correct Answer
Correct Answer
Lefthand side.
Middle
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Bottom.
Top.
Righthand side.
No.8: 8. Why are metals special?
Question
Which of the following are typical metal properties?
Answers
Correct Answer
Shiny and good conductors of heat and electricity.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Dull and poor conductors of heat and electricity.
Shiny and poor conductors of heat and electricity.
Dull and good conductors of heat and electricity.
Exercise No: 3
Name: 3. The Great Divide
No.9: 9. A closer look at metals
Question
Choose the correct order of words to fill the gaps: Magnesium burns brightly so is used for .... and
for .... in cameras; iron is used to make .....; nickel is used to make green .... and ......
Answers
Correct Order
E-B-D-A-C
Statement A
Statement B
Statement C
Statement D
Statement E
glass
flashbulbs
coins
steel
flares
No.10: 10. Non-metals
Question
Non-metals usually _______ and do not conduct heat.
Answers
Correct Answer
break when hammered
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
conduct electricity
can be hammered into shapes
are shiny and strong
No.11: 11.Investigating some non-metals (a)
Question
Answers
Which TWO of the following statements about oxygen are correct?
Correct Answer
Correct Answer
Oxygen makes up 20% of the air that we breathe.
Oxygen is needed to make things burn.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Oxygen is found in a quarter of our body.
There is just as much oxygen on Mars as there is on Earth.
Oxygen is colourless and odourless but tastes dreadful.
No.12: 12. Investigating some non-metals (b)
Question
Answers
Carbon is found in many different forms in nature. Why is carbon-14 so useful to archaeologists?
Correct Answer
It is radioactive and allows them to date artefacts.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It is the main ingredient in coal.
It is very rare.
It produces very pretty diamonds for rings.
Exercise No: 4
Name: 4. Compound Interest
No.13: 13. Elements and Compounds
Question
How many atoms of each element does copper carbonate - CuCO3 - contain?
Answers
Correct Answer
copper 1,carbon 1, oxygen 3
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
calcium 1, carbon 1, oxygen 3
copper 1, carbon 1, oxygen 1
copper 1, carbon 3, oxygen 3
No.14: 14. Molecules and compounds
Question
Answers
How many atoms of each element are present in this formula - MgCl2?
Correct Answer
magnesium 1, chlorine 2
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
No.15: 15.Reactions and Equations
Question
Choose the correct word equation for this description of a chemical reaction: Sodium reacts in
water to produce sodium hydroxide and hydrogen gas.
Answers
Correct Answer
sodium +water--> sodium hydroxide + hydrogen
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sodium --> sodium hydroxide + water
sodium + water --> sodium oxide + hydrogen
sodium --> sodium hydroxide + hydrogen
No.16: 16.More chemical reactions
Question
A compound _______ and can only be separated into its elements using chemical reactions.
Answers
Correct Answer
has properties different from the elements it contains
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
has substances that keep their own properties
has different substances that are not chemically joined together
variable composition
Question
Atoms could be said to be the 'Lego' from which Life is made. Do you think that this is a
good description of atoms? Explain your answer.
Expert
Teacher
Answer
Elements are simple substances, made up of very small particles called atoms. There are
approximately 100 elements known to man, yet it is very difficult to estimate the number of
compounds that exist. This is because compounds are made by joining atoms together in different
combinations. There is no limit to your imagination when confronted with a box of 'Lego', as you
can create whatever you like by assembling the pieces together in different ways. Elements are
similar. For example, your body contains three main elements, oxygen, carbon and hydrogen.
These elements can be combined together to make many different fats, proteins, carbohydrates,
sugars, and that is just for starters. They are also present in the DNA found in the cells of your
body. Yet the element carbon is also an important ingredient in objects such as your pencil case,
computer, MP3 player and in fact anything made of plastic!!
KS3 Science Unit 8F: Compounds and
mixtures
Exercise No: 1
Name: Elements and Compounds
No.1: Elements and Atoms
Question
Answers
Elements contain...
Correct Answer
Only one kind of atom.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
More than one kind of atom.
One atom.
More than one kind of atom chemically joined.
No.2: Compounds
Question
A compound is made from...
Answers
Correct Answer
More than one type of atom chemically joined together.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
One atom chemically joined together.
More than one atom mixed up together.
Chemicals atomically joined together.
No.3: Molecules
Question
Molecules are _______ that make up all living and non-living things.
Answers
Correct Answer
small particles
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
large particles
small atoms
large atoms
No.4: Formulae and Molecules
Question
Answers
A molecule of methane has the formula CH4 because it contains...
Correct Answer
One carbon atom and 4 hydrogen atoms.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
One carbon atom.
Two hydrogen atoms and one oxygen atom.
One carbon atom and 2 hydrogen atoms.
KS3 Science Unit 8F: Compounds and mixtures
Exercise No: 2
Name: Compounds and Reactions
No.5: The properties of Elements vs Compounds
Question
Which is a property of iron but not iron sulphide?
Answers
Correct Answer
It is magnetic.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It is brittle.
It is a compound.
It is made of molecules.
No.6: How many atoms?
Question
Answers
Copper oxide will always contain...
Correct Answer
1 copper atom and 1 oxygen atom that have reacted
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
1 copper atom.
1 copper atom and 1 oxygen atom mixed together.
1 oxygen atom joined to another.
No.7: Signs of Chemical reaction
Question
Which of these is not a sign of a chemical reaction?
Answers
Correct Answer
Melting.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Bubbles.
A colour change.
A precipitate (solid) is formed.
No.8: Examples of Chemical reactions
Question
What happens in an oxidation reaction?
Answers
Correct Answer
An oxide forms.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
An element turn into a oxygen.
Oxygen is taken away from an element.
An element breaks down and forms oxygen
Exercise No: 3
Name: Compound and Mixtures
No.9: Writing word equations
Question
The substances that are made by a chemical reaction are called the...
Answers
Correct Answer
Products
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Reactducts
Elements
Reactants
No.10: Symbol Equations
Question
Answers
Symbol equations use _______ to show what is happening in a chemical reaction.
Correct Answer
formulae
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
products
word equations
molecules
No.11: Compounds vs Mixtures
Question
Which are pure substances? There are TWO correct answers.
Answers
Correct Answer
Correct Answer
Elements
Compounds
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mixtures
Solutions
Air
No.12: Do compounds react?
Question
When chemicals react the new substances formed have _______ mass.
Answers
Correct Answer
the same
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
almost the same
less
more
Exercise No: 4
Name: Identifying Mixtures
No.13: What is air?
Question
Air is a mixture, which contains the elements...
Answers
Correct Answer
Nitrogen and oxygen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Nitrogen and carbon.
Carbon dioxide and oxygen.
Oxygen and water.
No.14: Melting and Boiling points
Question
Answers
Which substances have fixed melting points and boiling points? There are TWO correct answers.
Correct Answer
Correct Answer
Elements.
Compounds.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mixture.
Solutions.
Air.
No.15: Identifying Elements, Compound and Mixtures
Question
Answers
Which type of substance is sodium chloride?
Correct Answer
Compound.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Element.
Mixture.
Solution.
No.16: Examples of Elements, Compounds and Mixtures
Question
Which of these molecules is an element?
Answers
Correct Answer
Oxygen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Water.
Carbon dioxide.
Hydrogen chloride.
Question
Copper is an element, copper sulphate a compound, and copper sulphate solution a
mixture. List the differences between each type of substance.
Expert
Teacher
Answer
Elements; 1) Made up of one kind of element only. 2) Pure substances. 3) Cannot be broken
down into anything simplier. Compounds; 1) Made up of molecules. 2) More than one kind of
atom chemically joined. 3) Pure substances. Mixtures: 1) are materials made up of at least two
substances which may be elements or compounds. 2) Can be seperated easily. 3) Impure
substances.
KS3 Science Unit 8G: Rocks and
weathering
Exercise No: 1
Name: Rocks
No.1: Rock textures
Question
Answers
Rocks are:
Correct Answer
mixtures of minerals.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
mixtures of elements.
compounds.
mixtures of minerals and elements.
No.2: Mineral grains
Question
Which of these statements is true:
Answers
Correct Answer
Granite is made of interlocking crystals of more than one mineral.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Sandstone is made from interlocking crystals of a single mineral.
Granite is made of rounded grains cemented together.
Sandstone is made from interlocking crystals.
No.3: Texture
Question
The texture of a rock is a description of:
Answers
Correct Answer
the size and shape of its grains or crystals.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
what it feels like.
its hardness.
its colour and size.
No.4: Porosity
Question
A rock has a volume of 200 cubic centimetres. It absorbs 40 cubic centimetres of water. What is
its porosity?
Answers
Correct Answer
20%
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
240%
160%
40%
KS3 Science Unit 8G: Rocks and weathering
Exercise No: 2
Name: Breaking up rocks
No.5: Weathering 2
Question
Rocks are weathered and eroded when:
Answers
Correct Answer
parts of the rock get worn away.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the rock changes colour.
it rains a lot.
the rock is first formed.
No.6: Erosion 3
Question
Answers
Erosion happens when:
Correct Answer
weathered rock particles are carried away.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
rocks are broken into pieces.
rocks dissolve in acid rain.
rocks get heated too much.
No.7: Acid Rain 3
Question
Which of these is not caused by acid rain.
Answers
Correct Answer
limestone gets harder.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
marble statues lose their sharp edges.
limestone's surface gets covered with a layer of gypsum.
limestone's surface traps dirt and goes black.
No.8: Shattered
Question
Freeeze-thaw and expansion-contraction weathering happen when
Answers
Correct Answer
the weather keeps changing from hot to cold.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the weather is so cold that the rock freezes.
the weather is too hot.
rock is hit by thunder and lightning.
Exercise No: 3
Name: Moving rocks
No.9: Sediment
Question
Sediment is deposited when:
Answers
Correct Answer
a river slows down.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the weather gets colder.
the weather gets warmer.
a river speeds up.
No.10: Moving rocks
Question
Answers
Correct Answer
A fast stream carries large rocks.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A fast stream can only carry small rocks.
A slow stream cannot carry rock particles.
A slow stream can carry the biggest rocks.
No.11: Abrasion
Question
What happens to the rock particles a river transports?
Answers
Correct Answer
They get smaller due to abrasion.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They get bigger as mud sticks to them.
They gradually dissolve due to abrasion.
They stay the same size.
No.12: Deposition
Question
Sediment is composed of:
Answers
Correct Answer
particles of rock that get dropped when a river slows down.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
particles of rock that float on the surface of water.
dissolved rocks.
pieces of rock which were too large for the river to move.
Exercise No: 4
Name: Sediment formation
No.13: Strata
Question
Sediment forms layers because:
Answers
Correct Answer
the type of sediment carried, or the water speed, can change.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sediment is always dropped in the same place.
the older sediments lie on top of newer ones.
rivers can only carry a small amount of sediment at a time.
No.14: Fossils
Question
Answers
Fossils are:
Correct Answer
formed when dead animals or plants get trapped in sediments.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
markings in layers of sediment
animal skeletons.
always extinct animals.
No.15: Salt
Question
Salt forms a sediment when:
Answers
Correct Answer
it gets left behind when water evaporates.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it is carried into the sea by rivers.
it evaporates from the oceans.
it dissolves out of rocks.
No.16: Mars 2
Question
Which of the following would NOT form a sediment?
Answers
Correct Answer
Weathered rocks.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Sand grains dropped when a wind slows down.
Particles dropped when water slows down.
Compounds left behind when water evaporates.
Question
'Solid as a rock' is a popular expression. It describes something that is strong and never
changes. But how solid are rocks? Are some rocks more solid than others and do any
rocks last forever?
Expert
Teacher
Answer
Most rocks look solid but many are porous. They are made of rounded grains with spaces
between them. All rocks get weathered eventually and end up breaking down. But they don't
disappear. The particles get carried away by the wind or water and form deposits somewhere
else. So a piece of rock won't last for ever but the grains of mineral in it might.
KS3 Science Unit 8H: The rock cycle
Exercise No: 1
Name: Sedimentary rocks
No.1: Making new rocks
Question
Sediments turn to rock when their grains are compacted by pressure from the layers of sediment
above them, and _______ together by mineral crystals like calcite.
Answers
Correct Answer
cemented
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
squeezed
crushed
sedimented
No.2: Sedimentary Rock(s)
Question
What is the only type of rock which can contain fossils?
Answers
Correct Answer
Sedimentary
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Igneous
Metamorphic
Slate
No.3: Limestone
Question
Which sentence is a true description of limestone?
Answers
Correct Answer
It always contains calcium carbonate but the crystal size can vary
and there may be other minerals.
Incorrect Answer 1
It always has the same sorts of crystals because it is mostly calcium
carbonate.
It is pure calcium carbonate from the shells of sea creatures.
It is always white because it contains calcium carbonate.
Incorrect Answer 2
Incorrect Answer 3
No.4: Dissolving limestone
Question
What chemical in limestone reacts with acid to form carbon dioxide gas?
Answers
Correct Answer
calcium carbonate
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
calcium nitrate
calcium phosphate
calcium chloride
Exercise No: 2
Name: Metamorphic Rocks
No.5: Under pressure
Question
What two things cause the metamorphosis of rocks?
Answers
Correct Answer
Heat and pressure.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Pressure and steam.
Heat and time.
Time and pressure.
No.6: Marble
Question
Answers
Why does marble have many different colours?
Correct Answer
Because of the impurities in the parent rock.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Because of the heat and pressure.
Because there are many different sized crystals.
Because it is dyed.
No.7: Transformation
Question
Metamorphic rocks do not contain fossils because:
Answers
Correct Answer
they were destroyed when the rock formed.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
metamorphic rocks are too young to contain fossils.
fossils are only found in igneous rocks.
the sedimentary rocks they came from had no fossils.
No.8: Metamorphic rocks
Question
Which of these are metamorphic?
Answers
Correct Answer
A crystalline rock with bands of colour.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A crystalline rock full of air bubbles.
A smooth shiny rock with no obvious crystals.
A porous, powdery rock with bands of colour.
Exercise No: 3
Name: Igneous Rocks
No.9: The rock cycle
Question
Igneous rocks form when:
Answers
Correct Answer
magma solidifies
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
rock burns
sedimentary rocks are subjected to heat and pressure
sediments are compacted and cemented together
No.10: Crystals
Question
Answers
Igneous rock has small crystals when
Correct Answer
lava solidifies quickly.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the rock has a lot of impurities.
the rock is very pure.
magma stays hot for a long time in an underground chamber.
No.11: Granite
Question
The most common igneous rock used in buildings is:
Answers
Correct Answer
granite
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
obsidian
pumice
basalt
No.12: Building with igneous rocks
Question
Igneous rocks are used for building materials because they:
Answers
Correct Answer
are hard wearing
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
contain fossils which are attractive to look at.
have a sandy texture
are porous
Exercise No: 4
Name: The rock cycle
No.13: Volcanoes
Question
What do volcanoes produce?
Answers
Correct Answer
Lava
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Granite
Magma
Liquid water
No.14: Change
Question
Answers
Which of the following provide evidence that rocks can be subjected to strong forces?
Correct Answer
Rock layers can be tilted or folded.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Older rocks may be buried by younger layers.
Some rocks have smaller crystals than others.
Some rock layers are thinner than others.
No.15: Rock - Review
Question
Which TWO of the following rocks are metamorphic rocks?
Answers
Correct Answer
Correct Answer
marble
slate
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
granite
limestone
sandstone
No.16: Constant change
Question
Which of the following is not true?
Answers
Correct Answer
Igneous rocks are all formed from lava.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Metamorphic rocks can melt to form igneous rocks.
Heat and pressure can make sedimentary rocks metamorphic.
Eroded pieces of igneous rocks turn into sedimentary rocks.
Question
Explain how one sort of rock gets converted to another in the rock cycle.
Expert
Teacher
Answer
1. Sedimentary rocks form when water is squeezed out of sediments and the particles are
cemented together. 2. Heat and pressure cause metamorphosis: the buried rocks are changed
into hard crystalline metamorphic rocks, which often have a banded appearance. 3. Rocks may
be melted by heat from the mantle. The molten rock either cools slowly under the surface
(granite) or rises to the surface as lava (basalt ).
KS3 Science Unit 8I: Heating and
cooling
Exercise No: 1
Name: Temperature and heat
No.1: 1. Thermometers
Question
Answers
At which TWO of the following temperatures does pure water change it's state?
Correct Answer
Correct Answer
0°C
100°C
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
100°F
10°C
0°F
No.2: 2. Heat
Question
Answers
In hot water, the particles _______ than in cold water.
Correct Answer
move around faster
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
vibrate more
get hotter
get bigger
No.3: 3. Heat Flow
Question
Mrs Jones left a cup of tea on the table all day. What happened to its temperature?
Answers
Correct Answer
It ended up the same temperature as the air in the room.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It lost all its heat.
It got colder than the cup.
It went down to zero degrees.
No.4: 4. Heating
Question
When a material is heated, the extra heat energy:
Answers
Correct Answer
increases its temperature or changes its state.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
always makes the particles move around.
makes the material melt or boil.
always increases its temperature.
KS3 Science Unit 8I: Heating and cooling
Exercise No: 2
Name: Conduction and expansion
No.5: 5. Conduction
Question
When a solid is heated _______ and the vibrations are passed from atom to atom.
Answers
Correct Answer
the particles vibrate more
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the solid always melts
the hot particles move through the rod
the particles get hotter
No.6: 6. Insulation
Question
Answers
Which TWO of these materials are the best conductors of heat?
Correct Answer
Correct Answer
steel
iron
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
air
ash
carbon
No.7: 7. Expansion
Question
Answers
Solids expand when they are heated because:
Correct Answer
the particles vibrate more and push each other further apart.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the particles move apart to make room for the extra heat.
the particles get bigger.
the particles expand because they vibrate more.
No.8: 8. Gases
Question
Which two statements are true about gases?
Answers
Correct Answer
Correct Answer
Gases expand more than liquids and solids.
Gases are poor conductors because there is space between the
particles.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Gas is a good conductor because it expands when heated.
Gases particles expand whether you heat them or not.
Gas is an insulator so it does not expand.
Exercise No: 3
Name: Convection and radiation
No.9: 9. Hot Air
Question
What makes hot air rise?
Answers
Correct Answer
It is less dense than the surrounding air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cold air has heavier particles so it pushes the hot air up.
Hot air defies gravity.
It has lighter particles than the surrounding air.
No.10: 10. Convection
Question
Answers
Four students answered this question: Why does cold air sink? Which one got the answer wrong?
Correct Answer
Nimet: The particles in cold air are heavier.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Andrew: If a fluid has a higher density, it sinks to the bottom.
Tom: Cold air is denser than warm air.
Tara: The particles in cold air move closer together because they have
less energy.
No.11: 11. Radiation
Question
Answers
Which two of the following are properties of thermal radiation?
Correct Answer
Correct Answer
It travels in straight lines.
It can travel through a vacuum.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It travels by vibrating particles.
It only rises upwards.
It only travels in liquids and gases.
No.12: 12. Aerogel
Question
Answers
Which of the following statements is false?
Correct Answer
Insulation always stops convection as well.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Convection makes warmer air rise.
Air is a good convector of heat.
Good insulators contain trapped air.
Exercise No: 4
Name: Changing state
No.13: 13. States Of Matter
Question
Four students tried to say how solids and liquids are different. Which one got the answer wrong?
Answers
Correct Answer
Sam: Liquid particles don't touch each other.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Martin: Liquid particles have more energy.
Josh: Solid particles are stuck together, but liquid particles are loose.
Mary: In a solid the particles are stuck in one place, but in a liquid they
can move around.
No.14: 14. Melting
Question
Answers
Why does the temperature stay at 0°C while ice is being melted?
Correct Answer
The extra heat pulls the particles apart. It does not make them
move faster.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Heat only transfers to a solid after it has finished melting.
Water contains less heat than the same mass of ice.
Heat energy disappears when the ice melts.
No.15: 15. Heating and Cooling
Question
Answers
When water is freezing, what happens to its temperature?
Correct Answer
It stays the same. As heat moves out of the water the molecules
attract each other to form a solid.
Incorrect Answer 1
The temperature goes down, stays the same for a bit, and then goes
down again.
The temperature goes up as soon as the water stops freezing.
The temperature goes down because water has to lose heat to form
ice.
Incorrect Answer 2
Incorrect Answer 3
No.16: 16. Hot Metal
Question
Which of the following makes a molten metal cool down and solidify?
Answers
Correct Answer
All 3 of these.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Emission of infra red radiation.
Convection currents in the air.
Conduction of heat to the air.
Question
As soon as magma shoots out of a volcano, it starts to cool down. Explain where the heat
goes to, how it gets there, and why the magma shrinks slightly as it cools.
Expert
Teacher
Answer
Heat always spreads from hot areas to cold areas, so it would move from the magma to the air
and the ground around it. It would move from particle to particle by conduction - which would be
fastest through solids, especially metals. The heated air above the magma would rise by
convection and cold air would takes its place, so that conduction could continue. The hot rock
would also give off infra-red radiation. As the temperature drops, the particles lose energy and
move about less. They take up less space, so the magma contracts.
KS3 Science Unit 8J: Magnets and
electromagnets
Exercise No: 1
Name: About Magnets
No.1: What is a magnet
Question
Answers
Which answer contains TWO true statements?
Correct Answer
Magnetic forces are highest at the ends of the magnet and the
forcelines run from north to south.
Incorrect Answer 1
Magnetic forces are highest in the middle of the magnet and the
forcelines run from north to south.
Magnetic forces are highest in the middle of the magnet and the
forcelines run from south to north.
Magnetic forces are highest at the ends of the magnet and the
forcelines run from south to north.
Incorrect Answer 2
Incorrect Answer 3
No.2: Magnetic repulsion
Question
How do we test to see if metal bar is a magnet or just made from magnetic material?
Answers
Correct Answer
If it is a magnet one end will be repelled by the north pole of the
magnet.
Incorrect Answer 1
If it is painted red at one end and blue at the other it must be a
magnet.
If it is attracted to the south pole of the magnet it must be a magnet.
If it is attracted to the north pole of the magnet it must be a magnet.
Incorrect Answer 2
Incorrect Answer 3
No.3: How to make a magnet
Question
Choose the correct endings for these sentences: You can turn a needle into a magnet by......
When the needle is floated on water it will now always point to.......
Answers
Correct Answer
Correct Answer
north- it is now a compass!
stroking it with a magnet 30 times in one direction.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
stroking it with a needle 30 times, backwards and forwards.
south- it is now a compass!
lying it next to a magnet.
No.4: So what is this thing called magnetism?
Question
Answers
Correct Answer
A magnetic force is produced when all the electrons are
aligned(facing) in the same direction.
Incorrect Answer 1
A magnetic force is produced when all the protons are aligned(facing)
in the same direction.
A magnetic force is produced when all the electrons are
aligned(facing) in many directions.
A magnetic force is produced when all the protons are aligned(facing)
in many directions.
Incorrect Answer 2
Incorrect Answer 3
KS3 Science Unit 8J: Magnets and electromagnets
Exercise No: 2
Name: Magnetic Fields
No.5: So what metals are magnetic?
Question
Iron, steel, nickel and _______ are all magnetic metals.
Answers
Correct Answer
cobalt
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
aluminium
copper
gold
No.6: Magnetic fields (2)
Question
A magnet does not have to be touching another magnet to pull it or push it. We say that there is a
_______ around the magnet.
Answers
Correct Answer
magnetic field
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
magnetic hill
electric field
cow field
No.7: Field patterns
Question
A compass needle _______ when a compass is near a magnet.
Answers
Correct Answer
will follow the path of a magnetic field from north to south
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
will always be attracted to the magnet
will follow the path of a magnetic field from south to north
will not be affected
No.8: The Earths magnetic field
Question
The Earth's magnetic field is called the _______ It runs between its north and south magnetic
poles, and causes charged particles to get trapped along the field lines.
Answers
Correct Answer
magnetosphere.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
atmosphere.
stratosphere.
hemisphere.
Exercise No: 3
Name: Electromagnets
No.9: 9. Electromagnets
Question
To produce a powerful electromagnet it is best to use the following combination:
Answers
Correct Answer
a soft iron core, many turns of wire and a large current.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
many turns of wire and a large current.
a soft aluminium core, many turns of wire and a large current.
a soft iron core, many turns of wire and a small current.
No.10: How strong is my electromagnet
Question
One way to increase the strength of an electromagnet is to _______ Another is to increase the
current flowing through it.
Answers
Correct Answer
increase the number of turns, (coils).
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
decrease the number of turns, (coils).
decrease the supply voltage.
increase the resistance of the wire.
No.11: Uses of electromagnets.
Question
Put the following in the correct sequence to show how an electric bell works.
Answers
Correct Order
C-E-A-B-D
Statement A
Statement B
Statement C
Statement D
Statement E
The arm hits the gong.
The circuit is broken.
The switch is turned on.
The arm moves back.
The electromagnet attracts the arm.
No.12: Compasses
Question
Answers
Why does a compass needle point to the North?
Correct Answer
The Earth's magnetic field has its north pole high in the Arctic
circle.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The mountains in the Arctic are full of iron.
The mountains in the Arctic are full of magnetite.
The Earth's magnetic field has its south pole high in the Arctic circle.
Exercise No: 4
Name: Magnetic allsorts
No.13: Demagnetisation journey
Question
A magnet can be destroyed by hammering which causes the molecules and their poles to
become _______ Heating a magnet has the same effect.
Answers
Correct Answer
arranged randomly in all directions.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
arranged in order.
arranged with the north poles all pointing in the same direction.
arranged with the south poles all pointing in the same direction.
No.14: Magnetic fish and whales
Question
Research has shown that groups of whales will often get stranded on beaches with rocks with a
very high _______ content which probably interfere with the whale's magnetic navigation.
Answers
Correct Answer
iron
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
cheese
coal
copper
No.15: Magnets in action
Question
MRI scanners are used in many hospitals on a daily basis. They are important in the identification
of _______ in the body.
Answers
Correct Answer
cancers
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
diseases
major organs
bones
No.16: Revision journey
Question
An electromagnet is usually made from the flow of electricity down a coil. If we make the
electricity flow the opposite way through the circuit what happens to the magnet?
Answers
Correct Answer
The poles change to the opposite ends of the magnet.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The magnet gets stronger.
The magnet gets weaker.
It does not affect the magnet at all.
Question
What is a magnet?
Expert
Teacher
Answer
A magnet is an object made of certain materials which create a magnetic field. Every magnet has
at least one north pole and one south pole. By convention, we say that the magnetic field lines
leave the North end of a magnet and enter the South end of a magnet. If you take a bar magnet
and break it into two pieces, each piece will again have a North pole and a South pole. If you take
one of those pieces and break it into two, each of the smaller pieces will have a North pole and a
South pole. No matter how small the pieces of the magnet become, each piece will have a North
pole and a South pole.
KS3 Science Unit 8K: Light
Exercise No: 1
Name: Colour
No.1: Light designer
Question
Answers
Choose the best description of what happens when light shines on a CD.
Correct Answer
It splits up into different colours.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It is absorbed.
It reflects.
New colours appear.
No.2: The spectrum
Question
Newton proved that blue is _______ by shining it through a prism.
Answers
Correct Answer
one of the colours that makes up white light
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a visible colour
made of different colours
a cold colour
No.3: Filters
Question
Four students wrote about filters. Which one really understands how they work?
Answers
Correct Answer
Marek: Filters only let their own colours through. They absorb the
rest.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Abdul: Filters change the colour of light.
Kasia: Different filters let different colours through.
Sam: Filters separate the colours in white light.
No.4: Coloured Lights
Question
What colour would a green apple look under a red light?
Answers
Correct Answer
Black.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Red.
Blue.
Green.
Exercise No: 2
Name: Light
No.5: Light sources
Question
The moon looks bright because it _______.
Answers
Correct Answer
reflects light from the sun.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
is close to the Earth.
has a shiny surface.
gives out light.
No.6: Seeing the light
Question
Answers
A white cat reflects _______ light into our eyes than a black cat.
Correct Answer
more
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
less
dimmer
paler
No.7: Different surfaces
Question
How is light reflected when it hits a rough surface?
Answers
Correct Answer
In many directions.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Upwards.
At the same angle.
All in one direction.
No.8: Light control
Question
We can use mirrors to control where light goes because:
Answers
Correct Answer
they reflect light in a regular way.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
they absorb light.
they scatter light.
they form mirror images.
Exercise No: 3
Name: Reflection and refraction
No.9: Reflection
Question
The angle of incidence is equal to...
Answers
Correct Answer
the angle of reflection.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a right angle.
an acute angle.
the angle of the mirror.
No.10: Bending Light
Question
Answers
Which part of the eye bends light rays to focus them onto the retina?
Correct Answer
Lens
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Retina
Iris
Pupil
No.11: Refraction
Question
When light enters a glass block it _______ because one side of the beam slows down before the
other.
Answers
Correct Answer
bends inwards
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
speeds up
bends outwards
slows down
No.12: Shallow water
Question
When light moves from water to air it
Answers
Correct Answer
bends outwards
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
speeds up
bends inwards
slows down
Exercise No: 4
Name: Special effects
No.13: Mirrorless reflection
Question
A periscope uses _______ by prisms to turn light through 90 degrees.
Answers
Correct Answer
total internal reflection
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
refraction
reflection
dispersion
No.14: Trapping light
Question
Answers
Name the process that stops light crossing the boundary between transparent materials.
Correct Answer
Total internal reflection
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Scattering
Refraction
Absorption
No.15: Exciting lighting
Question
Light can be sent along transparent optical fibres. What keeps it inside the plastic?
Answers
Correct Answer
It undergoes total internal reflection.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The fibres run in straight lines.
The fibres are covered in black plastic.
The fibres are hollow.
No.16: Working with lasers
Question
What makes beams of laser light so easy to control?
Answers
Correct Answer
They do not spread out as much as ordinary light.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They have a specific colour.
They can be reflected and refracted.
They are very bright.
Question
Design the lighting for your favourite band. What filters you will use to get the colours you
want? How could you use mirrors, prisms or optical fibres in your scheme?
Expert
Teacher
Answer
Your lighting system could include: a. Light sources like lamps or lasers b. Filters to change the
colour of white light c. Mirrors or prisms to shine the light in different directions d. Lenses to focus
the light beams e. Optical fibres to make special effects
KS3 Science Unit 8L: Sound and
hearing
Exercise No: 1
Name: Good vibes
No.1: How the acoustic guitar makes sound.
Question
Answers
What produces the sound of an acoustic guitar?
Correct Answer
The vibrating strings
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The hollow box
The sturdy bridge
The open sound hole
No.2: How does a loudspeaker work?
Question
How are vibrations caused in the loudspeaker?
Answers
Correct Answer
The coil vibrates the speaker cone.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The electrical current stays the same.
The air vibrates.
The amplifier does it.
No.3: Does the speed of sound change in different med
Question
How does sound's speed change when it moves from air to water?
Answers
Correct Answer
It gets about 5 times faster.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It gets thousands of times faster.
It gets slower.
It stays the same.
No.4: Sound waves
Question
Answers
Order the following events in producing a sound wave:
Correct Order
C-B-D-E-A
Statement A
Statement B
Statement C
Statement D
Statement E
The vibrations get passed from particle to particle.
This compresses particles in front of it.
The object moves one way.
The object moves the other way.
This causes rarefaction of the particles in front of it.
KS3 Science Unit 8L: Sound and hearing
Exercise No: 2
Name: Perfect pitch
No.5: The frequency of sound
Question
What are the units of measurement of sound frequency?
Answers
Correct Answer
Hertz
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Hs
Htz
Hairs
No.6: Echoes
Question
Answers
What is an echo?
Correct Answer
A reflection of sound
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Absorption of sound
An insulator of sound
A type of animal
No.7: Amplitude
Question
As the amplitude of a sound wave increases, what happens to the size of a wave?
Answers
Correct Answer
It gets bigger
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It flattens out
It gets smaller
Nothing
No.8: Amplitude and loudness
Question
As the amplitude decreases, what happens to the loudness of the sound?
Answers
Correct Answer
Decreases
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Increases
Nothing
There are more waves
Exercise No: 3
Name: Cheers, ears
No.9: The Ear
Question
The smallest bones in your body are the _______ and they amplify the sound the most.
Answers
Correct Answer
hammer, anvil and stirrup
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
pinna
ear drums
cochlea
No.10: How do different instuments produce sound?
Question
Answers
Which one of these statements is correct?
Correct Answer
A long air column produces lower notes
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A long air column produces higher notes
A long air column produces louder notes
A long air column produces quieter notes
No.11: Frequency of human hearing
Question
What is the frequency range for human hearing?
Answers
Correct Answer
20 -20,000 Hz
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
0 - 10,000 Hz
5,000 - 50,000Hz
50,000 - 100,000 Hz
No.12: Different animals have different hearing range
Question
What is the name of the animal in the following list that can hear ultrasound?
Answers
Correct Answer
Bat
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Human
Rabbit
Elephant
Exercise No: 4
Name: Noise
No.13: Noise
Question
Rank the following noises in order of loudness (start with the quietest in the list):
Answers
Correct Order
C-B-E-A-D
Statement A
Statement B
Statement C
Statement D
Statement E
Rock music
Washing machine
Library
Rocket launch
Baby crying
No.14: Preventing noise
Question
How can you assess that the different modifications made to jet engines can reduce take-off
noise?
Answers
Correct Answer
By developing a computer model
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
By developing an airport at Cambridge University
By developing a silent aircraft
By developing a love of ear muffs
No.15: Using CD or MP3?
Question
Answers
Why is downloading MP3 files from the internet illegal?
Correct Answer
The originator owns the copyright
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The air pressure makes it hard
Track compression will hurt my ears
CDs contain too much memory
No.16: Noise damage
Question
What is the relationship between the amount of time you can be exposed to noise and the
loudness of the noise?
Answers
Correct Answer
As the noise increases by 10 decibels the time you can listen to it
decreases by 75%
Incorrect Answer 1
As the noise decreases by 10 decibels the time you can listen to it
increases by 75%
As the noise decreases by 10 decibels the time you can listen to it
decreases by 75%
As the noise increases by 10 decibels the time you can listen to it
increases by 75%
Incorrect Answer 2
Incorrect Answer 3
Question
Describe the stages of hearing a sound by a human.
Expert
Teacher
Answer
First the object vibrates. This causes the particles in the air surrounding the object to vibrate by
producing compressions and rarefactions in the air. The air particles transmit the sound waves to
the ear. This causes the eardum to vibrate, then the bones in the middle ear, then the oval
window to the cochlea (or inner ear). The liquid inside the cochlea vibrates and transmits the
sound waves to tiny hairs. These vibrate depending on the frequency of the sound wave and by
vibrating they send electrical impulses along nerves to the brain. The brain makes sense of the
loudness and pitch of the sound.
KS3 Science Unit 9A: Inheritance and
selection
Exercise No: 1
Name: Inheritance
No.1: Parents and children
Question
Answers
Which characteristics are most likely to be inherited from parents?
Correct Answer
Shape of nose, eyes or mouth.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Choice of clothes.
Hairstyle.
Position of scars.
No.2: Inherited characteristics
Question
Plants inherit characteristics from their parents, just like animals. Can you now work out which of
these is most likely to be inherited?
Answers
Correct Answer
Number of petals on a flower.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Height of a tree.
Number of leaves on a bush.
How far ivy spreads.
No.3: Genes
Question
Genes are found in the _______ of every cell.
Answers
Correct Answer
nucleus
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
centre
cytoplasm
membrane
No.4: Nature or nurture
Question
Nurture can involve a lot of different things and these are called ENVIRONMENTAL FACTORS.
Which of these factors would limit the final height of a tree?
Answers
Correct Answer
All of these.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Shortage of nutrients in the soil.
Lack of sunlight for photosynthesis.
Shallow soil that prevents root growth.
KS3 Science Unit 9A: Inheritance and selection
Exercise No: 2
Name: New Life
No.5: Fertilisation
Question
When sex cell nuclei fuse, a new individual forms. It has a unique set of genes because:
Answers
Correct Answer
half its genes come from each parent.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
genes change when sex cells form.
some genes from each parent can cancel each other out.
genes change slightly during fertilisation.
No.6: Egg and sperm
Question
Answers
Which TWO of the following are features of sperm cells but not egg cells.
Correct Answer
Correct Answer
Contains digestive enzymes.
Able to swim.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Stores large quantities of food.
Has a thick protective coat.
Has half as much genetic material as a normal body cell.
No.7: Ovule and pollen
Question
Answers
Choose two similarities between plant and animal fertilisation.
Correct Answer
Correct Answer
The male sex cell has to move to find the female sex cell.
The male nucleus fuses with the nucleus of the female cell.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The male sex cell swims towards the female sex cell.
The male sex cell grows a pollen tube.
The male sex cell carries enzymes to cut through the wall of the
female sex cell.
No.8: Twin studies
Question
Which of the following are likely to be more different in twins reared apart than in those reared in
the same home?
Answers
Correct Answer
Weight.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Shape of mouth.
Eye colour.
Curliness of hair.
Exercise No: 3
Name: Selection
No.9: Selective breeding
Question
Farmers improve crop yields by selecting plants with the best characteristics. If they plant the
largest seeds, _______ the seeds in the next crop will be larger.
Answers
Correct Answer
on average
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
most of
none of
all
No.10: Better tomatoes
Question
Which two tomatoes would you breed if you wanted to get a large red tomato that resists
disease?
Answers
Correct Answer
Correct Answer
Tiny red tomato that resists disease.
Large red tomato easily attacked by disease.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Small red tomato easily attacked by disease.
Tasty yellow tomato that resists disease.
Long-lasting yellow tomato easily attacked by disease.
No.11: Improving crops
Question
Answers
Which two traits would be worth improving in garden plants?
Correct Answer
Correct Answer
Size, shape, colour and length of blooming.
Resistance to disease and insects.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Nutritional value.
Total number of seeds produced.
Shelf life of fruits.
No.12: The right dog
Question
Answers
What is the main characteristic needed in a dog designed to detect drugs or explosives.
Correct Answer
Heightened sense of smell.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Ability to run fast.
Sharper teeth.
More aggressive nature.
Exercise No: 4
Name: Clones
No.13: Asexual reproduction
Question
Answers
Correct Answer
Asexual reproduction reduces variation because the offspring
have identical genes.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cloning allows you to choose which genes the offspring will inherit.
Asexual reproduction removes defective genes from a population.
Cloning allows you to increase the amount of variation in a population.
No.14: Cloning
Question
Answers
Correct Answer
A normal baby gets half its genes from each parent but a clonal
baby gets them all from one parent.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A clonal baby would have to get all its genes from its father.
A clonal baby would grow up to be exactly like one of its parents.
Clonal babies could only be girls because they are grown from their
mother's eggs.
No.15: Pros and Cons
Question
Cloning is useful but there are disadvantages. Which of the following should we be worried
about?
Answers
Correct Answer
Clones could all be wiped out by the same disease.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cloning could be used to save endangered species.
A lot of identical cloned plants can be grown very quickly.
Cloning allows the sex of animals to be chosen.
No.16: Should we do it?
Question
Answers
Which two arguments are scientific reasons for not trying to clone humans?
Correct Answer
Correct Answer
Cloned animals show a high rate of abnormality or disability.
The mothers of some cloned animals have died from pregnancy
complications.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It's a horrible idea.
Cloning is not natural.
Cloning does not respect human dignity.
Question
Farmers use selective breeding and cloning to produce new plants and animals. Say what
is involved in each technique, describe the genetic makeup of the offspring produced and
explain how this affects the amount of variation they show.
Expert
Teacher
Answer
Selective breeding produces improved varieties by combining sex cells from the best parents.
Each offspring gets a unique selection of genes so there is a lot of variation. Repeated selection
can gradually improve the characteristics of the population. Cloning produces large numbers of
identical individuals very quickly. A whole plant or animal can be grown from a single cell. Clones
have identical genes so they don't show much variation. Plants, and some invertebrates, have
always reproduced asexually. Plants can be cloned artificially using tissue culture and some
animals can be cloned using genes from one parent.
KS3 Science Unit 9B: Fit and healthy
Exercise No: 1
Name: Body Systems
No.1: Becoming fit
Question
Answers
Name the three different types of activities that help us to become fit in different ways.
Correct Answer
Aerobic, muscular strength & endurance, flexibility.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Aerobic, walking, stretching.
Muscular strength & endurance, walking, flexibility.
Flexibility, walking, stretching.
No.2: What is health related fitness?
Question
Health related fitness can be divided into four sections. What does the section 'Muscular
Endurance' mean?
Answers
Correct Answer
The ability of the muscle to work for long periods of time without
tiring
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The ability of muscles to work very quickly without tiring.
The ability of muscles to lift very heavy weights.
The ability of muscles to stop when they are tired.
No.3: Human Body System: Digestion
Question
We have chemicals in our bodies called _______ that help to break down our food.
Answers
Correct Answer
enzymes
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
entrails
endothermic
excrete
No.4: Human Body Systems: Skeleton.
Question
We have several different types of joints to help our skeleton move, but the joints in our _______
do not move at all.
Answers
Correct Answer
skull
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
knee
elbow
shoulder
Exercise No: 2
Name: All about breathing
No.5: Chemical Respiration
Question
Chemical respiration releases energy for our muscles to work. What TWO other substances are
made in the process of respiration?
Answers
Correct Answer
Correct Answer
Carbon dioxide
Water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Oxygen
Nitrogen
Sweat
No.6: Breathing - 1
Question
Answers
We have over 300 million tiny air sacs in our lungs. What name do we give to these tiny air sacs?
Correct Answer
The alveoli.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The raveoli.
The pleural membranes.
The intercostal sacs
No.7: Breathing - 2
Question
Answers
Which TWO of the following do we breathe out?
Correct Answer
Correct Answer
Carbon dioxide.
Water vapour.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Oxygen.
Condensation.
Cold air.
No.8: Why do people smoke?
Question
Answers
How many young people aged 11- 15yr have never ever tried smoking?
Correct Answer
More than 50%
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
More than 10%
About 25%
More than 90%
Exercise No: 3
Name: Use or Misuse
No.9: The Effects of Smoking on the Body
Question
Cigarettes contain the chemical _______ which makes smoking very addictive.
Answers
Correct Answer
nicotine
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
carbon monoxide
tar
carcinogens
No.10: What effect do drugs have on our body?
Question
The group of drugs called _______ carry a high risk of mental illness when taken by a young
person.
Answers
Correct Answer
hallucinogens
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sedatives
depressants
painkillers
No.11: Why do people take illegal drugs?
Question
Which of these reasons is valid for young people to use drugs?
Answers
Correct Answer
None of them
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Because it's cool
To feel more confident
Enhancing social activities
No.12: How does alcohol affect our body?
Question
Drinking too much alcohol over a long period can damage your health. What is the name of the
disease of the liver caused by drinking too much?
Answers
Correct Answer
Cirrhosis
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Jaundice
Liverishness
Paralysis
Exercise No: 4
Name: Healthy lifestyle
No.13: What makes a good healthy diet?
Question
Proteins _______ so they are very important in the diet of young people
Answers
Correct Answer
are necessary for growth of cells
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
keep the body warm
help fight off diseases
help make red blood cells
No.14: What happens when we do not eat a good healthy
Question
Answers
We are in danger of increasing our _______ if we eat too much saturated fat in our diet.
Correct Answer
cholesterol
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
glucose
plaque
calcium
No.15: What else can we do to maintain our fitness?
Question
Which of the following groups of exercises would be the most useful to increase muscle strength
and endurance?
Answers
Correct Answer
Circuit training, gymnastics, mountaineering.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cycling, walking, darts.
Circuit training, computer games, skateboarding.
Circuit training, swimming, snooker.
No.16: Are we healthier than our great-grandparents?
Question
How long was the average life expectancy of a man in 1901?
Answers
Correct Answer
45 years
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
40 years
50 years
60 years
Question
How have we improved our health so much from our great-grandparents time?
Expert
Teacher
Answer
We have learnt a great deal about eating correctly and about staying fit. Our diets have improved,
our health care has improved and our knowledge of substances that can cause us harm, such as
smoking tobacco and drinking excessive amounts of alcohol, have improved. If we look after
ourselves by taking exercise and eating properly and not taking harmful substances into our
bodies, it will improve our health and our life expectancy.
KS3 Science Unit 9C: Plants and
photosynthesis
Exercise No: 1
Name: Plants making food
No.1: Making Food
Question
Answers
What is the name of the process that plants use to make food?
Correct Answer
Photosynthesis
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Eating
Respiration
Nutrition
No.2: Photosynthesis The Basics
Question
Apart from sunlight, what are the 2 other things necessary for photosynthesis?
Answers
Correct Answer
Correct Answer
Carbon Dioxide
Water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Glucose
Sugar
Oxygen
No.3: Storing Food
Question
Which of these is formed when plants use glucose as an energy source?
Answers
Correct Answer
Carbon Dioxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cellulose
Starch
Proteins
No.4: Testing leaves for starch
Question
What colour will the leaf turn when starch is added if photosynthesis has taken place?
Answers
Correct Answer
Blue/Black
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Brown/Black
Green/Brown
Brown/Orange
KS3 Science Unit 9C: Plants and photosynthesis
Exercise No: 2
Name: Photosynthesis in more detail
No.5: Structure of Leaves
Question
What is the name of the pores (holes) on the surface of the leaf?
Answers
Correct Answer
Stomata
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Transpiration
Cuticle
Petioles
No.6: Measuring Photosynthesis
Question
Answers
To measure the speed of photosynthesis, we can _______ by the elodea.
Correct Answer
count the oxygen bubbles produced
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
count the bubbles of carbon dioxide produced
count the glucose bubbles produced
count the bubbles of starch produced
No.7: Limiting Factors
Question
Which of these activities will increase the rate of photosynthesis? There are TWO correct
answers.
Answers
Correct Answer
Correct Answer
Increasing the amount of carbon dioxide.
Increasing the amount of light.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Increasing the amount of oxygen.
Decreasing the amount of carbon dioxide.
Decreasing the amount of water.
No.8: Leaf cells
Question
Which are the leaf cells where most photosynthesis takes place?
Answers
Correct Answer
Palisade
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Epidermal
Chloroplast
Stomata
Exercise No: 3
Name: Roots and water
No.9: Plants and water
Question
Plants are supported by _______ inside their cells.
Answers
Correct Answer
water in the sap
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
water in the soil
water in the chloroplasts
water in the nucleus
No.10: Roots and water
Question
Answers
Once water has been absorbed into the roots, how is it carried to the rest of the plant?
Correct Answer
In the xylem
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
In the phloem
In the cortex
In the chlorophyll
No.11: root adaptations
Question
The roots have hair cells on them _______ as this helps them to absorb water and minerals.
Answers
Correct Answer
to increase the surface area
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
to protect them
to keep them warm
to lubricate them
No.12: Minerals
Question
Which TWO minerals from the list below do plants absorb from the soil to help keep them
healthy?
Answers
Correct Answer
Correct Answer
Nitrogen
Phosphorus
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Carbon Dioxide
Water
Iron
Exercise No: 4
Name: The importance of plants
No.13: What is the glucose used for?
Question
Why is the glucose converted to fat? There are TWO correct answers.
Answers
Correct Answer
Correct Answer
For storage
To make cell membranes
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
For respiration
To make genetic material
For transport
No.14: Plant Products 2
Question
Answers
Which TWO of these are examples of flowers that we use for food?
Correct Answer
Correct Answer
Cauliflower
Broccoli
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Carrots
Strawberries
Cabbage
No.15: finding a balance
Question
Answers
Which of these is NOT a reason why rainforests are important?
Correct Answer
They produce carbon dioxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They have a rich diversity of plants and animals
They produce oxygen
They take up carbon dioxide
No.16: Forest conservation
Question
Answers
How long do experts estimate until all the rainforest is destroyed if we carry on at this rate?
Correct Answer
40 years
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
400 years
100 years
10 years
Question
Sometimes people have introduced wild animals, like rabbits to countries. They have been
released into the wild and become successful. What would the main things be that make
them successful?
Expert
Teacher
Answer
The animal can find a suitable habitat - shelter? It will be able to find food It will be able to find
water. It will be able to adapt to the climate quickly It will have few or no competitors in its niche It
will be able to find a mate and reproduce? It will be protected from predators by 1.being
camouflaged 2.being able to escape from predators 3.or not having any predators
KS3 Science Unit 9D: Plants for food
Exercise No: 1
Name: Food and Food chains
No.1: Recapping Food Chains
Question
Answers
The second link in the food chain is always a...
Correct Answer
consumer.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
carnivore.
top consumer.
omnivore.
No.2: Producers and the Sun
Question
Pick 2 organisms that get their energy from the sun, to make their own food.
Answers
Correct Answer
Correct Answer
Trees.
Seaweed.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Cows.
Yeast.
Rabbits.
No.3: Food from plants.
Question
A carrot is an example of a _______ of a plant that we eat.
Answers
Correct Answer
root
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
leaf
stem
fruit
No.4: Starch storage
Question
The parts of the plant that store starch tend to grow
Answers
Correct Answer
under the ground.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
from the stem.
on the surface.
near the leaf.
Exercise No: 2
Name: Plant growth
No.5: Photosynthesis and Respiration
Question
During the daytime, plants...
Answers
Correct Answer
Respire and photosynthesise.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Just respire.
Just photosynthesise.
Do neither.
No.6: Minerals for plant growth
Question
Answers
Which mineral helps strong roots to develop?
Correct Answer
Phosphorus.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Calcium.
Nitrogen.
Potassium.
No.7: Fertilisers
Question
What percentage of potassium does a bag of 12-8-10 fertiliser have?
Answers
Correct Answer
10%
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
8%
12%
70%
No.8: Competition and Plant growth
Question
What substance do plants not compete for?
Answers
Correct Answer
Heat.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Light.
Water.
Nutrients.
Exercise No: 3
Name: Plants, food and problems
No.9: Food webs 3
Question
Wildebeast eat Acacia. What would happen to the number of Acacia Trees if the number of
Wildebeast increased?
Answers
Correct Answer
The number would decrease.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The number would increase.
The number would stay the same.
The number would increase then decrease.
No.10: Pyramid of Numbers
Question
Answers
A pyramid of number displays...
Correct Answer
The numbers of individuals in each population in a food chain.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The mass of organisms at each level.
How energy is distributed within a food chain.
The amount of energy that is consumed by the higher consumers.
No.11: Bioaccumulation
Question
A toxin is a poison that can be stored in the _______ of an organism.
Answers
Correct Answer
tissues
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
cells
organs
skin
No.12: The advantages and disadvantages of pesticides
Question
A problem with pesticides is that they...
Answers
Correct Answer
can harm the environment.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
kill plants.
kill insects.
can't kill insects.
Exercise No: 4
Name: Plants and the future
No.13: Predator and prey.
Question
In order to survive, Predator and prey must _______ together.
Answers
Correct Answer
adapt
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
eat
play
fight
No.14: Controlled growing
Question
Answers
Greenhouse tomatoes are grown because they...
Correct Answer
are protected from pests and diseases, so have a bigger harvest.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
are cheaper to grow.
taste delicous, and are nice in salads.
are protected from pests and diseases, so have a better appearance.
No.15: Sustainable development
Question
Sustainable development is all about growing crops whilst still looking after the...
Answers
Correct Answer
environment.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
grass.
profits.
energy levels.
No.16: Summary 3
Question
'They use the sun's energy in photosynthesis to produce new living material'. This definition refers
to...
Answers
Correct Answer
Producers.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Consumers.
Populations.
Decomposers.
Question
Describe what a fertiliser is, which nutrients it contains, and what they are used for.
Expert
Teacher
Answer
To make plants grow faster, what you need to do is supply the elements that the plants need in
readily available forms. That is the goal of fertiliser. A plant needs many nutrients to grow healthly,
but the ones which are supplied by a fertiliser are Nitrogen (N) for formation of genetic material,
Phospohrus (P) to develop cell membranes and for a plant to photosynthesise and Potassium (K)
for photosynthesis and respiration.
KS3 Science Unit 9E: Reactions of
metals and metal compounds
Exercise No: 1
Name: Important metals
No.1: Metal Basics
Question
Four students were asked to explain the difference between metals and non-metals. This is what
they said - which of them needs more help?
Answers
Correct Answer
Metals are good conductors of electricity and non-metals are
good conductors of heat.
Incorrect Answer 1
Most metals are hard dense solids. If a non-metal is a solid it is usually
dull and brittle.
Metals are all solid except for mercury, which is a liquid. Non-metals
can be gases.
Metals are shiny conductors but non-metals are dull insulators.
Incorrect Answer 2
Incorrect Answer 3
No.2: Copper
Question
Pick TWO properties of copper that make it useful for water pipes.
Answers
Correct Answer
Correct Answer
It can be easily joined.
It does not rust easily.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It has a high density.
It has a very attractive colour.
It is a good conductor.
No.3: Iron
Question
Iron is the best metal for building bridges because it is _______ and very cheap.
Answers
Correct Answer
very strong
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
magnetic
very shiny
a very good conductor
No.4: Aluminium
Question
Answers
Which of these is NOT a good reason for making lightweight planes out of aluminium?
Correct Answer
Aluminium has a high conductivity.
Incorrect Answer 1
Incorrect Answer 2
Aluminium forms strong structures.
A thin layer of aluminium oxide protects the metal from further
corrosion.
Aluminium has a low density.
Incorrect Answer 3
KS3 Science Unit 9E: Reactions of metals and metal compounds
Exercise No: 2
Name: Metals and acids
No.5: Reacting with acid
Question
When zinc was dropped into HCl (hydrochloric acid), bubbles of gas were produced and a
solution of zinc chloride formed. The gas must have been:
Answers
Correct Answer
Hydrogen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Oxygen.
Chlorine.
Hydrogen chloride.
No.6: Making salts
Question
Four students wrote about the reaction between zinc and hydrochloric acid. Who needs to pay
more attention in class?
Answers
Correct Answer
James: Zinc dissolves in acid.
Incorrect Answer 1
Clare: Smaller pieces of zinc react faster because more zinc atoms are
exposed to the acid.
Darren: The hydrogen given off in the reaction comes from the acid.
Olivia: When zinc reacts with acid the products are zinc chloride and
hydrogen.
Incorrect Answer 2
Incorrect Answer 3
No.7: Word equations
Question
Answers
When magnesium reacts with hydrochloric acid, the products are:
Correct Answer
Magnesium chloride + hydrogen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Magnesium hydroxide + hydrogen.
Magnesium chloride + a salt.
Magnesium hydrochloric + hydrogen.
No.8: More salts
Question
Answers
When a metal reacted with acid it made a solution of zinc sulphate. The acid must have been:
Correct Answer
sulphuric acid.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sulphide acid.
sulphur acid.
sulphate acid.
Exercise No: 3
Name: Oxides and carbonates
No.9: Acid reacting with carbonates
Question
The gas produced when an acid reacts with a carbonate:
Answers
Correct Answer
turns limewater cloudy.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
smells terrible.
relights a glowing splint.
pops with a lit splint.
No.10: Making salts from carbonates
Question
Which equation does NOT show what happens when hydrochloric acid reacts with copper
carbonate?
Answers
Correct Answer
Copper carbonate + hydrochloric acid --> copper sulphate + water
+ carbon dioxide.
Incorrect Answer 1
Copper carbonate + hydrochloric acid --> copper chloride + carbon
dioxide + water.
CuCO3 + 2HCl --> CuCl2 + H2O + CO2.
Acid + carbonate --> salt + water + carbon dioxide.
Incorrect Answer 2
Incorrect Answer 3
No.11: Reacting acid with oxides
Question
Answers
You want to turn copper oxide into copper sulphate. Put these steps into order.
Correct Order
E-B-D-A-C
Statement A
Statement B
Statement C
Statement D
Statement E
Filter to remove excess copper oxide.
Mix copper oxide with the warm acid.
Evaporate the water.
Add copper oxide until no more dissolves.
Take some sulphuric acid.
No.12: Making salts from oxides.
Question
Salts like copper sulphate are made by adding a metal oxide to sulphuric acid. If you were making
a salt which TWO of these things would you need to do?
Answers
Correct Answer
Correct Answer
Evaporate the water to get the salt crystals.
Make sure all the acid is converted to a salt by adding more than
enough of the oxide and filtering the excess.
Incorrect Answer 1
Make sure all the acid is converted to a salt by using an indicator to
see when the acid is neutral.
Make sure all the acid is converted to a salt by making sure the acid
does not get too hot.
Make sure all the acid is converted to a salt by using very dilute acid.
Incorrect Answer 2
Incorrect Answer 3
Exercise No: 4
Name: Acids and alkalis
No.13: Reacting acids with alkalis
Question
Four students wrote about the reaction between an acid and an alkali. Who needs more lessons?
Answers
Correct Answer
Lizzie: An acid and an alkali always make sodium chloride
solution when they react.
Incorrect Answer 1
Nardia: You can use an indicator to show when all the acid has
reacted.
Tony: They neutralise each other to make a salt plus water.
Olivia: Hydrogen from the acid reacts with hydroxide from the alkali.
Incorrect Answer 2
Incorrect Answer 3
No.14: Neutralisation
Question
Sodium hydroxide reacts with hydrochloric acid. The only equation that does not describe the
reaction is:
Answers
Correct Answer
sodium hydroxide + hydrochloric acid --> sodium chloride +
hydrogen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
acid + alkali --> salt + water.
HCl + NaOH --> NaCl + H2O..
sodium hydroxide + hydrochloric acid --> sodium chloride + water.
No.15: Getting a neutral solution.
Question
The best way to make sure that a neutral solution has been formed is to:
Answers
Correct Answer
add an indicator that gives a distinct colour when the solution
reaches pH 7.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
use very dilute acid and alkali solutions.
see if a salt is left behind when the solution evaporates.
add too much alkali and filter out the excess.
No.16: Summary
Question
What are the products of the reactions of a metal oxide with acid, and a metal hydroxide with
acid?
Answers
Correct Answer
Metal salt and water.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Salt and carbon dioxide.
Water and hydrogen.
Metal salt and hydrogen.
Question
Describe four ways of making salts. Name a salt each method could be used for, give the
equation and say how you know when all the acid is used up.
Expert
Teacher
Answer
Add a metal to an acid e.g. to make magnesium chloride add magnesium to hydrochloric acid
until no more dissolves. Magnesium + hydrochloric acid --> magnesium chloride + hydrogen. Add
a metal oxide to an acid e.g. to make copper sulphate add copper oxide t
KS3 Science Unit 9F: Patterns of
reactivity
Exercise No: 1
Name: Metals behaving badly?
No.1: 1. Corrosion
Question
Answers
Rust is _______ called iron oxide.
Correct Answer
a compound
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a mixture
an element
an alloy
No.2: 2. Dull metals?
Question
Alkali metals lose their shine quickly because they
Answers
Correct Answer
react with oxygen in the air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
react with nitrogen in the air.
get harder.
go rusty.
No.3: 3. Dangerous when wet!
Question
When sodium reacts with water
Answers
Correct Answer
it makes an alkali called sodium hydroxide.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it makes sodium oxide.
it bursts into flame.
it turns purple.
No.4: 4. Most Reactive?
Question
Answers
Which list shows the correct order of reactivity?
Correct Answer
potassium, sodium, lithium.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
potassium, lithium, sodium.
lithium, potassium, sodium.
sodium, lithium, potassium.
KS3 Science Unit 9F: Patterns of reactivity
Exercise No: 2
Name: The reactivity series
No.5: 5. Comparing reactivity
Question
When magnesium reacts with hydrochloric acid, it produces:
Answers
Correct Answer
magnesium chloride + hydrogen.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
magnesium chloride.
magnesium hydrochloride + hydrogen.
magnesium hydroxide + hydrogen.
No.6: 6. Unreactive
Question
Answers
Which metal reacts with oxygen but not with water or acid?
Correct Answer
Copper.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Lead.
Gold.
Zinc.
No.7: 7. A slow starter
Question
Aluminium appears to be unreactive because:
Answers
Correct Answer
its surface is covered with a protective layer of oxide.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it does not react with acids.
it will only react with hydrochloric acid.
it is near the bottom of the reactivity series.
No.8: 8. Periodic trends
Question
The most reactive metals are all in:
Answers
Correct Answer
Group 1.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Group 2.
Group 4.
Group 3.
Exercise No: 3
Name: Displacing metals from compounds
No.9: 9. Displacement
Question
Magnesium and iron both react with copper sulphate. Which of these is untrue?
Answers
Correct Answer
The more reactive metal always turns into copper.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The solution always changes colour.
The test tube always warms up.
The more reactive metal always dissolves.
No.10: 10. Making predictions
Question
Copper sulphate is blue. Zinc sulphate is colourless. What would you notice if zinc was added to
copper sulphate?
Answers
Correct Answer
The blue colour would fade.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The temperature would go down.
The zinc would turn black.
The solution would turn green.
No.11: 11. The thermit reaction
Question
The equation for the thermit reaction is:
Answers
Correct Answer
Aluminium + iron oxide -> aluminium oxide + iron
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Aluminium oxide + iron -> iron oxide + aluminium
Iron oxide + aluminium -> iron + aluminium
Iron oxide + aluminium -> heat + molten iron
No.12: 12. Releasing heat
Question
Which of the following is true for displacement reactions?
Answers
Correct Answer
The greater the difference in reactivity, the more heat released.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The weaker the metal displaced, the more heat released.
The more reactive a metal you add, the more heat released.
All displacement reactions release the same amount of heat.
Exercise No: 4
Name: Using metals
No.13: 13. Silver
Question
Which of the following explains why silver is used to make electrical contacts?
Answers
Correct Answer
It does not corrode.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It is expensive.
It conducts heat well.
It is cheap.
No.14: 14. Magnesium
Question
Answers
Magnesium is unsuitable for making car bodies because:
Correct Answer
it could catch fire if there was a crash.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it is too shiny.
it is too tough.
it is too light.
No.15: 15. Aluminium
Question
Aluminium is worth recycling because:
Answers
Correct Answer
it can be used over and over again.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it never loses its shine.
it is used to make drinks cans.
it takes a lot of energy to extract it from its ore.
No.16: 16. Iron
Question
The iron age came after the bronze age because:
Answers
Correct Answer
iron extraction requires very high temperatures.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
iron ores are rare.
iron is not as valuable as copper.
iron is not as useful as copper.
Question
Which metals in the reactivity series are suitable for making jewellery? Which are definitely
unsuitable? Explain your answers in detail.
Expert
Teacher
Answer
Gold, silver and copper are suitable for jewellery because they are unreactive, shiny, and
malleable. Group 1 metals are the most unsuitable metals for jewellery because they are too
reactive. These metals react instantly with oxygen to form a dull coating of the metal oxide. e.g.
sodium + oxygen -> sodium oxide. They also react with moisture to form a corrosive alkali which
would burn the skin. e.g. sodium + water -> sodium hydroxide + hydrogen.
KS3 Science Unit 9G: Environmental
chemistry
Exercise No: 1
Name: Soil 2
No.1: Soil
Question
Answers
The main components in soil are:
Correct Answer
organic material and minerals.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
rocks and minerals.
rocks and litter.
litter and humus.
No.2: Soil pH
Question
Most vegetables grow best when the soil pH value is:
Answers
Correct Answer
6.0 - 7.0.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
4.0 - 7.5.
5.5 - 7.0.
6.0 - 7.5.
No.3: Lime
Question
Which of the following describes sandy soil?
Answers
Correct Answer
free draining
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
needs a lot of lime to raise its pH
can get water logged
made of very fine particles
No.4: Pink flowers
Question
Answers
To turn acidic soils alkaline you should add _______ to neutralise the acid.
Correct Answer
powdered limestone
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
peat
sulphur
sodium hydroxide
KS3 Science Unit 9G: Environmental chemistry
Exercise No: 2
Name: Acid rain
No.5: Acid Rain 2
Question
Which of the following does NOT make rain acidic.
Answers
Correct Answer
lead dioxide
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sulphur dioxide
nitrogen dioxide
carbon dioxide
No.6: Sulphur dioxide
Question
Answers
Which of the following is the main industrial source of acid rain?
Correct Answer
power stations.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
traffic.
volcanoes.
coal mines.
No.7: Chemical weathering
Question
Which of the following types of rock is most affected by acid rain?
Answers
Correct Answer
limestone.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
slate.
granite.
sandstone.
No.8: Catalytic converters
Question
Catalytic converters cut acid rain by removing
Answers
Correct Answer
nitrogen oxides.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
carbon dioxide.
carbon monoxide.
all three of these gases.
Exercise No: 3
Name: Reducing pollution
No.9: Changes 2
Question
Which of the following describes the changes in sulphur dioxide emissions since 1970.
Answers
Correct Answer
They have fallen a lot.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They have risen.
They have stayed the same.
They fell at first and then remained steady.
No.10: Reducing damage
Question
Answers
Which of the following would NOT reduce the damage caused by acid rain?
Correct Answer
increasing the number of power stations.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
liming lakes.
sulphur scrubbing.
fitting catalytic converters.
No.11: Trends
Question
Long term trends in nitrogen dioxide levels are difficult to spot because:
Answers
Correct Answer
data has only been collected for a few years.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the graph keeps going downwards.
the meters used to measure the gas are unreliable.
nitrogen dioxide levels are measured in ppb.
No.12: Taking measurements
Question
Which of these units could NOT be used to show how much pollution the air contains:
Answers
Correct Answer
milligrams.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
parts per billion by volume.
milligrammes per cubic metre.
microgrammes per cubic metre.
Exercise No: 4
Name: Global warming
No.13: Venus
Question
Which of the following statements are true? Choose the 2 correct answers.
Answers
Correct Answer
Correct Answer
Venus has most carbon dioxide in its atmosphere.
Venus is the hottest planet even though it is not closest to the
sun.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Mars has the most carbon dioxide in its atmosphere.
Mercury is the hottest planet because it is closest to the sun.
All the planets have similar carbon dioxide levels in their atmospheres
except Earth.
No.14: Evidence 2
Question
Which of the following describes the way Earth's surface temperature has changed since the
1970's?
Answers
Correct Answer
The temperature fluctuates from year to year but the overall trend
is upwards.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The average temperature has stayed the same.
The ocean temperature is rising faster than the atmosphere's.
The temperature fluctuates so much that the overall trend is difficult to
spot.
No.15: Consequences
Question
Answers
Which of the following is NOT an expected consequence of global warming?
Correct Answer
Hurricanes, tornadoes and other storms will get less common
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Sea levels will rise.
Some plants and animals will become extinct.
Crops yields will be reduced where there is not enough rain.
No.16: Questions
Question
What is the best evidence global warming may not be the result of human activities?
Answers
Correct Answer
The Earth has warmed up and cooled down many times in the
past.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
England used to be even warmer than it is now.
An ice age is about to start so temperatures will fall.
Our temperature measurements are not that accurate.
Question
In England, most electricity is produced by burning coal. The process releases carbon
dioxide and sulphur dioxide. Explain why it would be better for the environment if we cut
our use of electricity.
Expert
Teacher
Answer
Less carbon dioxide and sulphur dioxide would be formed so the effects of these pollutants would
be reduced. Sulphur dioxide causes acid rain, which reduces soil fertility and damages trees,
buildings and fresh water animals. Carbon dioxide contributes to global warming which culd raise
sea-levels and cause major changes in weather patterns.
KS3 Science Unit 9H: Using chemistry
Exercise No: 1
Name: Burning things
No.1: Fuels 2
Question
Answers
A fuel is something that:
Correct Answer
gives out energy when it burns.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
takes in energy when it burns.
gets hot on its own.
always makes carbon dioxide when it burns.
No.2: Hydrocarbons
Question
Oil is a mixture of hydrocarbons. What does it form when it burns?
Answers
Correct Answer
carbon dioxide and water
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
carbon and hydrogen oxide
hydroxide and carbon dioxide
carbon dioxide and hydrogen
No.3: Hydrogen 2
Question
When hydrogen is oxidised to water the reaction is:
Answers
Correct Answer
explosive.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
quite slow.
quite fast.
only fast when it's heated.
No.4: Hydrogen under pressure
Question
Answers
Hydrogen for use in cars is stored under very high pressures because:
Correct Answer
the tank needs to hold enough fuel for long journeys without
being too large.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
hydrogen will escape if it isn't kept at high pressures.
a car engine will not burn hydrogen unless its pressure is high.
high pressure tanks are less likely to explode if there is an accident.
Exercise No: 2
Name: Releasing energy
No.5: Fireworks
Question
Sparklers and matches contain the same fuel. Which two elements form the fuel?
Answers
Correct Answer
sulphur and carbon.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
sulphur, carbon and a binder.
carbon, sulphur and an oxidiser.
potassium nitrate, sulphur and carbon.
No.6: Oxidisers
Question
Matches contain an oxidiser called potassium chlorate. Oxidisers release oxygen to make things
burn better. What part of potassium chlorate's name shows it contains oxygen?
Answers
Correct Answer
The -ate.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The o in chlorate.
The o in potassium.
The chlor-.
No.7: Electrical Cells
Question
A voltage can be produced if two metals are stuck into a lemon. Which of the following correctly
describes the metals.
Answers
Correct Answer
They have to be different.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They have to be the same.
At least one of them has to be a penny.
They have to be touching.
No.8: Getting more volts
Question
To produce a high voltage in a simple cell you need:
Answers
Correct Answer
two metals with a big difference in reactivity.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
two identical metals.
copper and any other metal.
any two metals with similar reactivities.
Exercise No: 3
Name: Useful reactions
No.9: Hot cans
Question
A self-heating can works because:
Answers
Correct Answer
some chemical reactions release energy.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
quicklime burns when it gets wet.
some chemical reactions take in heat.
quicklime burns when oxygen gets to it.
No.10: Oil
Question
Answers
Which of the following describes the manufacture of plastics from oil?
Correct Answer
Chemical reactions are used to make new materials.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Chemical reactions are used as energy resources.
Chemical reactions are important in living systems.
Separating oil into fractions is a physical change.
No.11: Drugs
Question
New drugs are aften very expensive. Which of the following is NOT a good reason why.
Answers
Correct Answer
Drugs are manufactured using chemical reactions.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It takes a long time to get a newly discovered drug on the market.
Most of the chemicals a drug company discovers never go on sale.
A company needs to employ a lot of scientists to discover new drugs.
No.12: Plant products
Question
Which of the following BEST describes the production of motor fuel from corn?
Answers
Correct Answer
Chemical reactions are important in plants and provide new
sources of energy.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Chemical reactions are used as energy sources.
Chemical reactions are used to make new materials.
Chemical reactions are important in biological systems.
Exercise No: 4
Name: New materials
No.13: Rearranging atoms
Question
If you burn 12g of carbon in 32g of oxygen, how much carbon dioxide will you get?
Answers
Correct Answer
44g
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
12g
24g
32g
No.14: Gaining mass
Question
Answers
If you heat a piece of copper, its mass goes up because:
Correct Answer
it reacts with oxygen from the air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
it burns to produce carbon dioxide.
it expands because of the heat.
its mass has to be conserved.
No.15: Using graphs
Question
The mass of carbon dioxide produced can be predicted from the mass of gas burned. This is
because:
Answers
Correct Answer
one gas molecule always makes one molecule of carbon dioxide.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
methane reacts with oxygen when it burns.
4kg of methane makes 11g of carbon dioxide.
methane produces carbon dioxide when it burns.
No.16: Losing mass
Question
When a candle burns its mass decreases. Choose the best explanation for this.
Answers
Correct Answer
The combustion products escape into the air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The wick reacts with oxygen when it burns.
The wax all evaporates because of the heat from the burning wick.
The wax gets lighter when it burns.
Question
Explain what happens during a chemical reaction and why they are so useful.
Expert
Teacher
Answer
During a chemical reaction atoms rearrange themselves to form products. Atoms are never lost or
gained but the mass can appear to change if a gas is gained or lost. Chemical reactions are
useful in two ways: many of their products are useful new materials and the reactions themselves
can be a source of energy.
KS3 Science Unit 9I: Energy and
electricity
Exercise No: 1
Name: Energy Transfer
No.1: Changing Energy
Question
Answers
Which of the following is true about energy transfer? There are TWO correct answers.
Correct Answer
Correct Answer
Energy is never created and never destroyed
Energy can be transferred from one type to another
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Wasted energy is energy that has been destroyed
Wasted energy is said to have been dispatched
There are only three types of energy
No.2: Using Energy to do Work
Question
Answers
Which of these is a device for changing energy into useful forms to do work?
Correct Answer
Machine
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Transformer
Energiser
Tool
No.3: Storing Energy
Question
When a circuit is connected _______ are produced in electric cells and these flow around the
circuit.
Answers
Correct Answer
electrons
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
protons
neutrons
atoms
No.4: Energy Review
Question
When and object has energy because of its condition or position, this is called _______ energy.
Answers
Correct Answer
potential
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
kinetic
triggering
conservation of
KS3 Science Unit 9I: Energy and electricity
Exercise No: 2
Name: Electric Circuits
No.5: Why is Electricity so Useful
Question
Which of these can you not get from electricity?
Answers
Correct Answer
Nuclear energy
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Heat energy
Light energy
Movement energy
No.6: Voltage and Current
Question
Answers
Which of the following is correct?
Correct Answer
Current is the flow of charge and is measured with an ammeter
connected in series.
Incorrect Answer 1
Current is the flow of charge and is measured with a voltmeter
connected in series.
Current is the flow of charge and is measured with an ammeter
connected in parallel.
Current is the energy carried by the electrons and is measured with an
ammeter connected in series.
Incorrect Answer 2
Incorrect Answer 3
No.7: Basic Circuits 2
Question
In a parallel circuit, if one bulb blows, there is still a _______ circuit through the other bulb so it
keeps glowing brightly.
Answers
Correct Answer
complete
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
compact
compound
complex
No.8: What's a Watt
Question
Which TWO of these correctly describes power?
Answers
Correct Answer
Correct Answer
How quickly energy is transferred.
The rate of energy transfer.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
How strong a machine is.
How loud a machine is.
How quickly a machine works.
Exercise No: 3
Name: Using Electricity
No.9: The National Grid
Question
What is the voltage of electricity in overhead power cables?
Answers
Correct Answer
400,000 V
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
12 V
230 V
40,000 V
No.10: Electrical Safety
Question
Electricity can cause injury or even death. To get a large current through your body, a high
_______ is needed. The main voltage at home is high enough to kill.
Answers
Correct Answer
voltage
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
resistance
power
conductivity
No.11: Paying for electricity
Question
How much would it cost to run a 2kW kettle for 15 minutes if the price of 1kWh of energy is 5p?
Answers
Correct Answer
2.5p
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
150p
5p
0.25p
No.12: Generating Electricity
Question
Approximately how much of the UK's electricity is generated using both coal and natural gas?
Answers
Correct Answer
Two thirds
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
One half
One quarter
One third
Exercise No: 4
Name: Energy Resources
No.13: Energy Resources 2
Question
Electricity is called a _______ energy source because we get it from the conversion of other
sources of energy, like coal, natural gas and other natural sources.
Answers
Correct Answer
secondary
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
primary
renewable
useful
No.14: Renewable Energy Resources
Question
Answers
Which TWO of these are NOT renewable energy resources?
Correct Answer
Correct Answer
Coal
Natural Gas
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Wind
Tidal
Solar
No.15: Energy Efficiency
Question
A car transfers the chemical energy in petrol into the following forms of energy. Which is the most
useful form of energy for a car?
Answers
Correct Answer
Kinetic
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Light
Sound
Thermal
No.16: Conserving Energy Resources
Question
There are limited amounts of _______ energy resources. They cannot be replenished and cannot
be used again. We must save as much energy as we can.
Answers
Correct Answer
non-renewable
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
renewable
free
green
Question
What are the advantages and disadvantages of generating electricity using the wind as
opposed to burning coal?
Expert
Teacher
Answer
The advantages of generating electricity using the wind are that it is a renewable energy resource
whereas coal will one day run out. Wind power does not produce pollution where burning coal
produces greenhouse gases and contributes to acid rain. Once the wind turbines are built, they
are cheap to run whereas coal is expensive to mine. The disadvantages of wind power are that
lots of turbines are needed to produce the same amount of electricity as one coal fired power
station. Wind turbines are thought by some to be an eyesore and are noisy. They may also affect
the wildlife in the environment in which they are sited.
KS3 Science Unit 9J: Gravity and
space
Exercise No: 1
Name: Gravity
No.1: How does gravity work?
Question
Answers
Four students made notes on how gravity works. Which of them needs help with this topic?
Correct Answer
Kevin: There is one sort of gravity that makes you fall and
another sort that makes planets orbit the sun.
Incorrect Answer 1
Sam: The planets orbit the sun because its gravitational force attracts
them.
Casey: The gravitational pull between 2 objects is strongest when they
have a lot of mass and are very close together.
Jade: Every object attracts every other object. We only notice the force
of gravity when one of the objects has a lot of mass, like the Earth.
Incorrect Answer 2
Incorrect Answer 3
No.2: Earth's gravity
Question
Which of the following is NOT true?
Answers
Correct Answer
There is no gravity in space.
Incorrect Answer 1
Incorrect Answer 2
The gravitational force on a spacecraft changes after it is launched.
Gravity pulls satellites towards the centre of the Earth when they are in
orbit.
The gravitational force on a satellite depends on its mass and how
close it is to Earth.
Incorrect Answer 3
No.3: The Moon's gravity
Question
The Moon's gravity is about one sixth of the Earth's. How much would a 12 kilogram dog weigh on
the Moon?
Answers
Correct Answer
About 20 newtons.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Approximately 120 newtons.
Around 72 newtons.
Close to 2 kilograms.
No.4: Changing weights
Question
On Jupiter, the force of gravity is about 25 N/kg, so a 50 kg person weighs about .....
Answers
Correct Answer
1250 N.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
125 N.
500 N.
5000 N.
KS3 Science Unit 9J: Gravity and space
Exercise No: 2
Name: Developing Ideas
No.5: Measuring gravity
Question
Which of the following statements is WRONG?
Answers
Correct Answer
Only large masses like the Earth produce a force of gravity.
Incorrect Answer 1
Incorrect Answer 2
Your body is attracting the Earth.
The size of the force of gravity depends on the mass of each object
and the distance between them.
To work out the gravitational force between objects you need to
measure the distance between their centres of mass.
Incorrect Answer 3
No.6: Changing ideas
Question
If you double your distance from the centre of the Earth, the force of gravity is .....
Answers
Correct Answer
reduced to one quarter of its original value.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
unchanged.
multiplied by four.
reduced to half its original value.
No.7: Rockets.
Question
Answers
It sometimes takes a long time for new ideas to be accepted if ........
Correct Answer
people have existing ideas which are difficult to change.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the evidence is clear cut.
they agree with common sense.
scientists publish their work.
No.8: Observing the planets
Question
Answers
Which of these is NOT one of Galileo's ideas?
Correct Answer
The Sun orbits the Earth and the rest of the planets orbit the sun.
Incorrect Answer 1
Jupiter has moons orbiting it which proves that everything in the
universe does not revolve around the sun.
The Copernican system that placed the Sun in the centre of the
Universe is correct.
The Moon is covered in craters and mountains, so the heavenly bodies
are not all perfect spheres.
Incorrect Answer 2
Incorrect Answer 3
Exercise No: 3
Name: Using gravity
No.9: The zero G illusion
Question
Astronauts feel weightless when the shuttle is in orbit because....
Answers
Correct Answer
they are in free fall.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
they have escaped Earth's gravity.
they are moving very fast.
there is no air resistance.
No.10: Staying in orbit.
Question
Answers
A rocket is in orbit. Which of the following is NOT true.
Correct Answer
It is free from Earth's gravity.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
It is pulled towards the centre of the Earth by gravity.
It would need to fire its engines to head for the moon.
It would drop towards Earth if it slowed down.
No.11: Using gravity
Question
When a spacecraft gets close to a moon or planet gravity always makes it...
Answers
Correct Answer
speed up.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
crash.
go into orbit.
slow down.
No.12: The moon landings
Question
Who was the first man to step onto the Moon?
Answers
Correct Answer
Neil Armstrong.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Laika.
Buzz Aldrin.
Yuri Gagarin.
Exercise No: 4
Name: Satellites
No.13: The Moon's orbit
Question
Anything which orbits a planet is called a....
Answers
Correct Answer
satellite.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
asteroid.
space station.
moon.
No.14: Artificial satellites
Question
Answers
A TV satellite would be put into...
Correct Answer
a geostationary orbit that stays over one place.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a polar orbit that stays over one place.
a polar orbit that covers all parts of the Earth.
a geostationary orbit that covers all parts of the Earth.
No.15: Keeping satellites in orbit
Question
Which kind of satellite mentioned in the information you read, uses a geostationary orbit?
Answers
Correct Answer
Weather satellite.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Spy satellite.
Polar orbiting satellite.
Ocean-monitoring satellite.
No.16: Uses of satellites
Question
Satellites that need to be in consant communication with receivers on the ground are placed in ...
Answers
Correct Answer
geostationary orbits.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
high orbits.
polar orbits.
low orbits.
Question
1. Explain why your bathroom scales would give different readings on different planets. 2.
The scales would register zero in the space station. Does that mean there is no gravity
there? Explain your answer. 3 Artificial satellites are put in two main type
Expert
Teacher
Answer
1. Even if the scale tells you your mass in stones or kilograms, it is using your weight in Newtons
to get the reading. This is the force of gravity pulling you towards the centre of the planet. A planet
with more mass would have a bigger gravitational force and give a larger weight in Newtons. Your
mass would be unchanged but you would not be able to read if from the same scales. 2. The
Earth's gravitational pull is still very strong where the space station is. The scales read zero
because the orbiting space station is falling towards the Earth. It stays in orbit because its
horizontal motion makes it follow a curve as it drops - which exactly matches the Earth's curve. 3.
The two main types of orbit are geostationary (used for communications) and low polar (used for
weather monitoring).
KS3 Science Unit 9K: Speeding up
Exercise No: 1
Name: Speed
No.1: Getting Faster
Question
The 100m world records are held by Tim Montgomery (9.78s) and Florence Griffith-Joyner
(10.49s). Times show that _______ faster.
Answers
Correct Answer
Tim Montgomery is
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Florence Griffith-Joyner is
all men are
all women are
No.2: Measuring Speed
Question
The 800m world record holder ran his race in 86 s. What was his average speed?
Answers
Correct Answer
9.3 m/s
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
0.93 m/s
9.1 m/s
10.3 m/s
No.3: Train speeds
Question
If a train covers 1 mile in 30 seconds, how fast is it going?
Answers
Correct Answer
120 mph.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
30 mph.
60 mph.
180 mph.
No.4: Car speeds
Question
Some students rolled cars down wooden ramps and measured their speed at the bottom. Which
of the following would you expect them to find?
Answers
Correct Answer
The steeper the ramp, the faster the cars.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
The longer the ramp, the faster the cars.
The lower the ramp, the faster the cars.
The more friction on the ramp, the faster the cars.
Exercise No: 2
Name: Adding forces
No.5: Reaction time
Question
In 1960, a 100 metres freestyle swimmer was given times of 55.0s, 55.1s and 55.1s by three
different timers. A likely reason for the difference is that:
Answers
Correct Answer
human reaction times differ.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
one of the timers took too long to stop the timer.
one of the timers pressed start too early.
one of the stopclocks was slow.
No.6: Speed skaters
Question
Answers
Which of the following would increase the friction between two layers of metal.
Correct Answer
Removing the layer of oil between them.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Giving both layers a coat of Teflon.
Putting ball bearings between the layers.
Blowing a cushion of air between the layers.
No.7: Pushing cars
Question
Which of the following are true?
Answers
Correct Answer
The same force will make a smaller car gain more speed.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Equal forces give all cars the same speed.
Forces have more effect on cars with more mass.
Forces speed things up but they slow down by themselves.
No.8: Flying
Question
The force that keeps a plane in the air is called:
Answers
Correct Answer
upthrust or lift.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
weight.
thrust.
drag or air resistance.
Exercise No: 3
Name: Moving faster
No.9: Maglev trains
Question
Which of these facts about about Maglev trains is NOT true:
Answers
Correct Answer
They are pushed along by jets of air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
They are streamlined to reduce air resistance.
They hover above the rails to reduce friction.
They have low masses to cut the force needed to accelerate them.
No.10: HPVs
Question
Answers
Which of the following features does NOT reduce the air resistance of an HPV?
Correct Answer
Turbulent air flow around the shell.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A curved profile.
A slim, low body.
A smooth shiny outer shell.
No.11: Using fuel
Question
Which of the following would reduce a vehicle's fuel consumption?
Answers
Correct Answer
Keeping below 50 mph.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Carrying a heavier load.
Hanging flags out of each window.
Having new tyres with deeper treads.
No.12: Atmospheric braking
Question
When the Space Shuttle re-enters the Earth's atmosphere it heats up. This is because:
Answers
Correct Answer
it collides with particles of air.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
hot objects slow down quicker.
the tiles on its surface are designed to take the heat.
the Earth's upper atmosphere is warmer than outer space.
Exercise No: 4
Name: Using graphs
No.13: Sky Diving
Question
Which of the following shows the correct sequence of events once you begin a parachute jump?
Answers
Correct Answer
speeding up, constant speed, slowing down, constant speed
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
speeding up, slowing down, constant speed
speeding up, constant speed, slowing down
speeding up, constant speed, speeding up, constant speed
No.14: Speed-time graphs
Question
Answers
The flat part of a speed-time graph shows:
Correct Answer
constant speed.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a stationary car.
a steady increase in speed.
terminal velocity has not been reached.
No.15: Comparing graphs
Question
On a speed-time graph, getting steadily faster is shown by:
Answers
Correct Answer
a straight line going up.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a series of steps going up.
a curved line going up.
a straight line going down.
No.16: Falling faster
Question
A player runs forward, stops to take a kick and then runs forward faster. His distance-time graph:
Answers
Correct Answer
slopes up, stays flat, and then slopes up again more steeply.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
goes straight up, drops down, and then goes up even higher.
goes straight up, stays flat, and then goes up even higher.
slopes up, drops down, and then slopes up again more steeply.
Question
A Japanese team achieved a world record fuel consumption of 11,193 mpg in 2003. How
would you design a car for maximum fuel economy and how could you measure its speed?
Expert
Teacher
Answer
It needs a low mass to minimise the force needed to get it moving; a streamlined shape to reduce
air resistance and smooth tyres to minimise friction with the road. It should travel as slowly as
possible to minimise drag. Speed is distance/time, so you would need to time how long it took to
cover a known distance.
KS3 Science Unit 9L: Pressure and
moments
Exercise No: 1
Name: Pressure
No.1: Sharp as a knife?
Question
Answers
Skis don't sink into the snow because:
Correct Answer
they spread the skiers weight over a large area.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
their large area reduces the force on the snow.
their small area reduces the pressure.
they spread the force so the pressure is greater.
No.2: Bed of Nails
Question
Lying on a 'bed of nails' doesn't hurt because:
Answers
Correct Answer
your body weight is spread over a lot of nails.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the force is concentrated on a small area.
you only touch half the nails.
each nail only weighs 100g.
No.3: Under pressure 2
Question
Which of these statements is correct?
Answers
Correct Answer
The pressure is higher when the force is bigger and the area is
smaller.
Incorrect Answer 1
The pressure is always lower when the force is lower and the area is
smaller.
The pressure is lower when the force is higher and the area is smaller.
The pressure is higher when the force is lower and the area is smaller.
Incorrect Answer 2
Incorrect Answer 3
No.4: Calculations
2
Question
A runner weighs 750N. The area of one of his trainers is 250 cm . When he puts all the weight on
one foot the pressure is:
Answers
Correct Answer
3 N/cm
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
1/3 N/cm
2
500 N/cm
2
1.5 N/cm
2
2
KS3 Science Unit 9L: Pressure and moments
Exercise No: 2
Name: Higher and deeper
No.5: Units
Question
Which of these is NOT a unit for pressure?
Answers
Correct Answer
kilograms.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
pascals.
newtons per square metre.
newtons per centimetre squared.
No.6: Air 2
Question
Answers
Air pressure is caused by:
Correct Answer
particles moving in all directions and colliding with things.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
particles pressing down.
particles squeezing things.
particles moving around very fast.
No.7: Particles
Question
As you climb a mountain, the density of the atmosphere decreases. This reduces the pressure
because:
Answers
Correct Answer
collisions with air particles are less frequent.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the air is more compressed.
the particles of air move faster.
the weight of air above the mountain is more.
No.8: Going deeper
Question
Water pressure gets greater:
Answers
Correct Answer
the deeper you go.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the nearer the surface you are.
when the current is faster.
when you get further from the shore.
Exercise No: 3
Name: Multiplying forces
No.9: Hydraulics
Question
Hydraulic systems are used to:
Answers
Correct Answer
send a force from one place to another using the pressure in a
liquid.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
tell you when the car's brakes are on.
carry water pressure around corners.
make sure the force is the same at both ends of a tube of water.
No.10: Multiplying the force
Question
Hydraulic fluid can transmit forces between two cylinders. If the second cylinder has double the
area the force will be:
Answers
Correct Answer
doubled.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
halved.
the same.
nine times as big.
No.11: Levers
Question
Answers
A lever is:
Correct Answer
a simple machine for changing the size of a force.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
a pivot.
a plank that increases the pressure of a force.
a device that increases the size of a force without changing anything
else.
No.12: Types of lever
Question
Answers
Which of the following would NOT make a lever a better force multiplier?
Correct Answer
Using the tips of scissors to cut.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Placing a nut closer to the pivot of some nutcrackers.
Using longer handles on a wheelbarrow.
Putting the load closer to the pivot than the effort on a see-saw.
Exercise No: 4
Name: Force and balance
No.13: Lifting
Question
The biceps is attached close to the pivot at the elbow. This makes:
Answers
Correct Answer
a small movement of the biceps cause a large, fast movement of
the hand.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
your elbow lift.
the hand move in the opposite direction.
the hand exert a greater force when it moves.
No.14: Antagonistic Muscles
Question
Answers
When you straighten your arm:
Correct Answer
the biceps relaxes and the triceps contracts.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the biceps contracts and the triceps relaxes.
the biceps and triceps both relax.
the biceps and triceps both contract.
No.15: Moments
Question
Answers
A 400N boy sits 2m from the pivot of a see-saw and a 300N girl sits 3m away. Do they balance?
Correct Answer
No - the girl's end goes down.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Yes because the boy is heavier but closer.
Yes because the girl is lighter but further from the pivot.
No - the girl's end goes up.
No.16: Balancing
Question
An object is balanced when:
Answers
Correct Answer
the clockwise and anticlockwise moments are balanced.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the clockwise and anticlockwise forces are balanced.
opposite forces are equal in size and direction.
one force is nearer to the pivot than the other.
Question
Levers and hydraulic systems can both be used in machinery to multiply forces. Explain
how each of them would be able to double a force.
Expert
Teacher
Answer
Levers multiply forces if the load is closer to the pivot than the effort. When the distance is
doubled the force doubles. The equation is: anticlockwise moment = clockwise moment, where
moment = force x distance from pivot. Hydraulic systems have 2 pistons joined by a tube of fluid.
The liquid is incompressible so it transmits pressure equally in all directions. This makes a piston
with double the area exert double the force.
KS3 Science Unit 9M: Investigating
scientific questions
Exercise No: 1
Name: Introduction
No.1: What is an Investigation?
Question
Answers
Which of the following is NOT a step in the investigative process?
Correct Answer
Distilling
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Planning
Recording Evidence
Evaluating
No.2: What is a 'hypothesis'?
Question
A hypothesis is...
Answers
Correct Answer
An educated guess about a scientific question.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
A way of plotting graphs.
A place where hypocondriacs meet.
A definate, true scientific law.
No.3: What are Variables?
Question
Which variable is deliberately changed during the experiment?
Answers
Correct Answer
Independent (input)
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Dependent (outcome)
Key
Controlled
No.4: What is a Prediction?
Question
Answers
A prediction is a statement of the expected _______ of the experiment based on the hypothesis.
Correct Answer
results
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
plan
method
analysis
KS3 Science Unit 9M: Investigating scientific questions
Exercise No: 2
Name: Planning
No.5: Selecting the right equipment.
Question
Which piece of equipment would you use to measure the volume of liquids accurately?
Answers
Correct Answer
Measuring cylinder.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Digital balance.
Thermometer.
Gas syringe.
No.6: What is fair testing?
Question
To plan an investigation to see if acid reacts faster with magnesium at higher temperatures, which
variables would we keep the same? Find TWO correct answers.
Answers
Correct Answer
Correct Answer
Volume of acid.
Mass/length of magnesium ribbon.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Temperature of acid.
Temperature of magnesium.
Size of Bunsen burner.
No.7: What is a method?
Question
Answers
A good method should always be written in...
Correct Answer
the past tense.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the present tense.
with a pencil.
the future tense.
No.8: Writing a good plan.
Question
Which of these is not part of a good plan?
Answers
Correct Answer
Graph.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Prediction.
Equipment list.
Method.
Exercise No: 3
Name: Observation and Analysis
No.9: Precision and reliabilty
Question
Preliminary work is testing your _______ before you actually do your practical part of your
investigation.
Answers
Correct Answer
method
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
analysis
observations
conclusion
No.10: Making Observations
Question
Answers
Which of the following is NOT true about observing?
Correct Answer
You must always use all your senses when observing.
Incorrect Answer 1
In the Science laboratory only taste or smell something if your teacher
says it is safe to do so.
When observing, you should think about which senses are appropriate
to use.
Observing can involve measuring.
Incorrect Answer 2
Incorrect Answer 3
No.11: Conclusion 2
Question
Answers
A good analysis must include a...
Correct Answer
Graph.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Method.
Results Table.
Prediction.
No.12: Analysis
Question
Answers
Generally, you should plot _______ on the x-axis.
Correct Answer
the independent (input) variable
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
the dependent (outcome) variable
the labels of the axes
the title of the graph
Exercise No: 4
Name: Evaluation and summary
No.13: Evaluation
Question
An evaluation is NOT linked to
Answers
Correct Answer
a future investigation on a different topic.
Incorrect Answer 1
whether someone else doing your investigation would get the same
results.
how reliable your results are.
how valid your results are.
Incorrect Answer 2
Incorrect Answer 3
No.14: Modelling coursework
Question
Answers
Which one of these was not a key factor of this experiment?
Correct Answer
Size of metal.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Contact of metal with salty air.
Type of metal.
Coating metal with paint or grease.
No.15: Summary 2
Question
Answers
'POAE' describes the order for doing things in an investigation. What does 'POAE' stand for?
Correct Answer
Planning, Obtaining, Analysing, Evaluating
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Purpose, Opening, Analysing, Extracting
Planning, Obtaining, Analysing, Explaining
Preparing, Obtaining, Apparatus, Experiment
No.16: How much water do apples contain?
Question
To find out the amount of water in an apple we must...
Answers
Correct Answer
Weigh, dry it out then weigh it again.
Incorrect Answer 1
Incorrect Answer 2
Incorrect Answer 3
Dry it then weigh it.
Weigh it.
Weigh it then dry it.
Question
You have been asked to find out 'How does the concentration of salt in a salt water
solution affect buoyancy?'. Assuming we would use floats to test this, what would the
variables of this investigation be?
Expert
Teacher
Answer
1) The concentration of salt water solution. 2) The volume of salt water solution. 3) The size of the
float. 4) The surface area of the float. 5) The heaviness/density of the float.

Key Stage 3 Science

Transcription

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