STD-7 SCIENCE

Date:
Day :
Dr. PVT PRIMARY GIRLS’ SCHOOL (E.M.)
SA – II (2013-14)
Class : VII
Subject : Science
Time:
M M : 60
Q1. Choose the correct alternative:
(20)
1. Which of the following is called a producer?
(A) Cow (B) Human being
(c) Plants (D) Snake
2. Which gas is responsible for acid rain?
(A) Hydrogen (B) Sulphur dioxide
(C) oxygen (D) Ammonia
3. In which organ are involuntary muscles present?
(A) Hand (B) Leg (C) Neck (D) Heart
4. Which structure protects the brain?
(A) Skull (B) ligment (C) finger (D) ribcage
5. What is the symbol of magnesium?
(A) Mg (B) Mn (C) Me (D) Ma
6. Separate the one which differs from the others.
(A) Air (B) Water (C) Soil (D) Mixture of rice and pulses
7. Which mirror is used as a side glass in vehicles?
(A) Concave (B) Convex (C) Plane (D) Parabolic
8. What type of image is always obtained by a convex mirror ?
(A) Virtual and diminished
(B) Virtual and enlarged
(C Real and inverted
(D) Real and erect
9. How many bones make up ribcage?
(A) 14 (B) 24 (C) 25 (D) 33
10. What is the proportion of carbon dioxide in the atmosphere?
(A) 0.04% (B) 2% (C) 0.07% (d) 1%
11. Which of the following is not a compound?
(A) Sugar (B) Salt (C) Water (D) Gold
12. What is the vertebral column made up of?
(A) Pectoral girdle (B) Vertebrae (C) Pelvic girdle
(D) Ligament
13. Which poisonous and foul smelling gas is released due to the
Decay of substances?
(A) Carbon dioxide
(B) Carbon monoxide
(C ) Hydrogen sulphide
(D) Sulphur dioxide
14. Which type of organism is a frog?
(A) Producer (B) Herbivore (C) Carnivore (D) Omnivore
15. Where is the wild ass seen?
(A) Gir forest (B) Rann of Kachchh (C) Bharatpur sanctuary
(D) Sunderbans Sanctuary
16. How many bones together make up the skeleton of the
Human body?
(A)
200 (B) 180 (C) 213 (D) 100
17. What should be the angle between two plane mirrors to
get 5 images of an object?
(A) 60
(B) 72
(C) 90
(D) 120
18. Which curved mirror is used as a shaving mirror?
(A) Plane (B) Concave ( c) Convex (D) None of the given
19. What is the symbol of helium?
(A) H (B) He (C) Hl (D) Hi
20. If the angle between two plane mirrors is 40 , how many
Images are formed of an object kept between them ?
(A) 10 (B) 9 (C) 7
(D) 8
Q2 (A)
1.
2.
3.
4.
5.
6.
7.
8.
Fill in the blanks:
Vertebral column protects the _____________.
______________is released by organisms during exhalation.
_______________ image is formed by a plane mirror.
Sweet singing birds are _________ and ___________.
The two plane mirrors are arranged in a ___________ at 45 .
___________ make use of plants as food and get energy.
Common salt is a ______ and its molecular formula is _____.
_________is the longest and the strongest bone of our body.
4
(B) Answer the following question in one sentence: (any 8)
8
1. Which gas is used by plants during photosynthesis and which
Gas is released?
2. What is the full form of PUC?
3. How many images of an object are formed. If the angle
between two plane mirrors is 20 ?
4. State the relation between the radius of curvature and the
focal length of a curved mirror?
5. Of which two elements is water composed?
6. Which structure protects the heart and the lungs?
7. What is the function of skeleton?
8. For whose protection and breeding is ‘Sunderbans Sanctuary’
Established o in West Bengal?
9. On what principle does the kaleidoscope work?
10. How does sunlight help in reducing air pollution?
11. Where is the biggest aviary of India situated?
12. What happens when a strip of magnesium is burnt in air ?
(C) Define: (any 3)
1. Element 2. Focal length of a curved mirror
3. Convex mirror 4. Food chain 5. Angle of incidence
3
Q3. (A) Answer the following questions in short:(any 4)
8
1. Explain that water is a compound.
2. State the laws of reflection of light.
3. What would happen if there are no bones in our body.
4. What is acid rain?
5. State the characteristic of the image formed by a plane mirror.
6. State the four trophic levels of a food chain.
(B)
1.
2.
3.
Write differences: (any 2)
Compound and mixture
Voluntary muscles and Involuntary muscles
Regular reflection and irregular reflection
4
(C ) Classify the following into element, compound and mixture:
3
Water, iron, air, silver, sugar, solution of glucose
1. Elements______________________
2. Compounds____________________
3. Mixture__________________
Q4. (A) Give scientific reasons: (any 2)
1. Bones are necessary for the body.
2. Convex mirror is used as a ‘side glass’ in vehicles.
3. Green plants are called producers.
4
(B) Describe , with neat diagram, the following experiment: 3
1. To determine that the given substances are good conductor or
insulator of electricity. ( Matchstick, iron key, rubber, pencil)
2. To separate the components of a mixture of camphor and common
salt.
(C ) Write true or false.
1. The image formed by a plane mirror is always in front
of the mirror.
(
)
2. A convex mirror has its outer surface polished.(
)
3. A concave mirror always forms a real image. (
)
4. Atom is the constitutional unit of an element.(
)
5. Bat is a mammal, it is not a bird.
(
)
6. Muscles con not be contracted or relaxed. (
3
)