TOPICAL TEST YEAR 7 CHAPTER 6
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10
Carlos investigates sound using a bell in a glass jar.
Look at his assembled equipment.
bell
hammer
glass jar
air
(a) Explain why Carlos hears a sound when the hammer hits the bell.
[3]
(b) Carlos removes all of the air from the glass jar using a pump.
The hammer hits the bell.
Explain why Carlos does not hear a sound when there is no air in the glass jar.
[1]
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7
2
Echolocation is used by bats to find their prey.
prey
bat
represents sound made by the bat
represents sound travelling towards the bat
(a) Explain how the bat uses echoes to find the prey.
[2]
(b) The prey moves closer to the bat.
Describe how the bat knows, using echoes, that the prey is closer.
[1]
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10
8
3
Volcanoes form at the boundaries of tectonic plates.
Look at the diagram.
volcanoes
position X
ocean
tectonic
plate
mantle
tectonic
plate
(a) Describe why tectonic plates move.
[2]
(b) Volcanoes erupt and release gases.
The table shows the percentages of different gases in the air at position X, on the side of a
volcano.
The percentages are measured just before, during and after a volcanic eruption.
percentages of gas in the air
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name of gas
just before
eruption
during
eruption
after
eruption
nitrogen
75
3
78
oxygen
18
0
20
argon
1
0
1
carbon dioxide
6
97
1
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(i) The percentages of gases in the air just before and after an eruption are different.
Describe two of these differences.
1
2
[2]
(ii) A scientist makes a prediction,
‘It is possible to tell when a volcano is just about to erupt when the percentage of
carbon dioxide in the air on the side of the volcano increases.’
Does the data in the table support this prediction?
Tick () the correct answer.
yes
no
Explain why.
Use information from the table.
[1]
(c) Write down one other reason for an increase in the percentage of carbon dioxide in air.
[1]
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14
11
4 Yuri stands next to a cliff.
He claps his hands once.
He hears a sound.
A short time later, he hears another sound.
Explain why Yuri hears another sound a short time after hearing the first sound.
[2]
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54
Look at the diagram of a model of a tectonic plate boundary.
tectonic plate
magma
(a) Describe three events that occur near this type of tectonic plate boundary.
1
2
3
[3]
(b) Complete the sentences about the model of plate tectonics.
Choose from the list.
atmosphere
magma
core
mantle
crust
water
The solid outer layer of the Earth consists of the
and the upper part of the
.
The solid outer layer of the Earth has tectonic plates that move.
The tectonic plates move because of
flow in the mantle.
[2]
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67
Yuri draws a diagram to show how he hears the sound made by a loudspeaker.
loudspeaker
Yuri
The dots in the diagram represent air particles.
(a) Describe what happens to air particles when the loudspeaker makes a sound.
[2]
(b) Explain why sound does not travel through a vacuum.
[1]
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