Energy Practice Exam Questions Level 5-8

Kibworth High School Science Revision
Energy
Practice Exam Questions
Level 5-8
Name:_________________________
Parents signature:________________
Please can parents sign to confirm that the students completed the questions
and then marked and corrected their work using the mark scheme.
Students may complete the questions either;
a) Under exam conditions
b) Using a revision guide or web based resource such as
bbc bitesize ks3 science.
1.
James shone a ray of light at a mirror as shown below.
Completed booklets should be returned to school / with parent signature
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incident ray
mirror
angle of incidence
angle of reflection
reflected ray
diagram 1
He measured the angle of reflection for different angles of incidence.
His results are shown below.
angle of incidence (º)
30
40
50
60
70
angle of reflection (º)
30
40
50
65
70
(a)
Which angle of reflection was not measured accurately?
..................°
How can you tell this from the table?
.........................................................................................................................
.........................................................................................................................
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1 mark
(b)
James set up a different experiment as shown below.
glass block
incident ray
angle of incidence
angle of refraction
refracted
ray
diagram 2
He measured the angle of refraction for different angles of incidence.
His results are shown in the graph.
30
20
angle of
refraction (º)
10
0
0
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20
40
60
angle of incidence (º)
3
Use the graph to answer the questions below.
(i)
When the angle of refraction is 20°, what is the angle of incidence?
..................°
1 mark
(ii)
What conclusion could James draw from his graph?
Complete the sentence below.
When light passes from air into glass, the angle of incidence is
always .......................................................... the angle of refraction.
1 mark
(c)
On diagram 2, draw a line to continue the refracted ray as it leaves the glass
block.
1 mark
maximum 4 marks
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2.
Imran built a puzzle circuit with three identical bulbs and a 3V battery.
He covered the connections to the bulbs with a piece of card as shown below.
The bulbs could be seen through holes in the card.
3V battery
A
C
card
B
All the bulbs were on but their brightness was different.
Lucy removed bulbs A, B and C in turn. Before connecting each bulb back into the
circuit she observed the effect on the other two bulbs.
She recorded her observations in the table below.
bulb removed
observations
A
B and C stayed on
B
C went off
A stayed on
C
B went off
A stayed on
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(a)
Complete the circuit diagram below to show how the three bulbs could be
connected.
Use your knowledge of series and parallel circuits, and the observations in the
table to help you.
3V battery
A
C
B
2 marks
(b)
Imran used three identical bulbs but their brightness was different.
Which bulb was the brightest? Give the letter.
...............
Give the reason for your choice.
.....................................................................................................................
.....................................................................................................................
1 mark
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(c)
Imran added a switch to the circuit so that he could turn all three bulbs
on and off at the same time.
Place a letter S on your circuit diagram where this switch could be placed.
1 mark
maximum 4 marks
3.
(a)
The diagrams below show the patterns produced on an oscilloscope by three
different sound waves.
A
(i)
B
C
Which two waves have the same loudness?
Write the letters.
............ and ............
How do the diagrams show this?
...............................................................................................................
...............................................................................................................
1 mark
(ii)
Which two waves have the same pitch?
Write the letters.
............ and ............
How do the diagrams show this?
...............................................................................................................
...............................................................................................................
1 mark
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(iii)
Shuli is listening to a sound that produces the pattern below.
X
Y
Describe how the sound that Shuli hears changes between X and Y.
...............................................................................................................
1 mark
(b)
The table below shows the maximum time a person can listen to music at
different sound levels without damage to the ear.
sound level (decibels)
maximum time (hours)
86
8
88
4
90
2
92
1
94
0.5
Estimate the maximum time a person could listen to a sound of 87 decibels.
............ hours
1 mark
c)
The diagram below shows part of the human ear.
What happens to the ear drum as a sound gets louder?
........................................................................................................................
........................................................................................................................
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1 mark
maximum 5 mark
4.
Keith has a wind-up radio.
It does not use batteries. It is powered by a steel spring.
(a)
Keith winds up the spring.
As the spring unwinds, potential energy in the spring is transferred to a generator,
which then turns.
The generator provides electrical energy for the radio.
Fill the gaps in the sentences below to show the useful energy changes which
take place in the generator and the speaker.
(i)
As the generator turns, ............................................................. energy is
changed to electrical energy.
1 mark
(ii)
In the speaker, electrical energy is changed to
............................................................. energy.
1 mark
(b)
When Keith turns the volume up so that the radio is louder, the spring
unwinds more quickly.
Why does the spring unwind more quickly?
.........................................................................................................................
.........................................................................................................................
1 mark
(c)
The radio has a solar cell which can also provide electrical energy.
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Keith winds up his radio and takes it outside without changing the volume.
The steel spring unwinds more slowly when sunlight falls on the solar cell.
Explain why.
.........................................................................................................................
.........................................................................................................................
1 mark
(d)
The wind-up radio was designed for use in poorer countries.
Suggest why wind-up radios are useful in poorer countries.
.........................................................................................................................
.........................................................................................................................
1 mark
maximum 5 marks
5.
(a)
Peter had two different coloured tennis balls as shown below.
He shone white light through a red filter onto each ball.
(i)
experiment 1
The white ball appeared red.
Explain why this ball appeared red.
................................................................................................................
................................................................................................................
................................................................................................................
................................................................................................................
2 marks
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(ii)
experiment 2
What colour did this ball appear?
..........................................................
Explain your answer.
................................................................................................................
................................................................................................................
2 marks
(b)
Peter set up a different experiment.
He cut three holes in a piece of card.
Two of the holes were covered by coloured filters as shown below.
red filter
green filter
clear
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Peter placed a red filter between the piece of card and a white screen.
He shone white light at the piece of card with three holes in it.
white screen
red filter
white
light
What would Peter see on the screen?
.........................................................................................................................
.........................................................................................................................
1 mark
maximum 5 marks
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6.
The human eye detects red light, blue light and green light. A combination of red, green
and blue light is seen as white. We ‘see’ other colours when different combinations of
red, blue and green enter the eye. This is shown in the table.
(a)
light entering
the eye
colour ‘seen’ by
the eye
no light
black
red
red
blue
blue
green
green
red + blue
magenta
blue + green
cyan
red + green
yellow
red + blue + green
white
Some magenta paint is illuminated by a combination of red, green and blue light.
Explain why the paint appears magenta.
......................................................................................................................
......................................................................................................................
......................................................................................................................
2 marks
(b)
A mixture of cyan paint and yellow paint appears green in a combination of
red + blue + green light. Explain what happens to:
(i)
the red light? .......................................................................................
1 mark
(ii)
the blue light? .....................................................................................
1 mark
(iii)
the green light? ...................................................................................
1 mark
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(c)
Most colours of paint can be obtained by mixing different combinations of cyan,
magenta and yellow paints.
What combination of these paints makes:
(i)
blue paint?
............................................................................................................
1 mark
(ii)
red paint?
............................................................................................................
1 mark
Maximum 7 marks
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