Key Stage 3 Science Book 3 Assessments
Exploring Contact and Non-Contact Forces (Purple level)
1. Complete this sentence about energy when a change happens: The quantity of energy stored before
the change is __ [1 mark]
a) less than the energy stored after the change
b) the same as the energy stored after the change
c) more than the energy stored after the change
d) used up
2. Which statement about how an image is formed in the human eye is correct? [1 mark]
a) Light is refracted by the cornea and lens onto the retina
b) Light is refracted by just the lens onto the optic nerve
c) Light is reflected by just the lens onto the retina
d) Light is refracted by just the lens onto the retina
3. Which statement about a hot metal pan cooling down is false? [1 mark]
a) A hot metal pan will cool down by thermal conduction and radiation
b) A hot metal pan will cool down until thermal equilibrium has been reached
c) A hot metal pan will cool down as its molecules vibrate less
d) A hot metal pan will cool down faster if placed on a thermal insulator
4. Match the descriptions to the types of wave. [1 mark]
A wave which moves up and down
Longitudinal
A water wave
Longitudinal
A sound wave
Transverse
A wave which moves forwards and
backwards
Transverse
5. Which two statements about red and blue light are correct? [1 mark]
a) Red light has a longer wavelength than blue light
b) Red light has a shorter wavelength than blue light
c) Red light has a higher frequency than blue light
d) Red light has a lower frequency than blue light
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
6. A beam of light from a torch is shone through a glass window. Which two statements about it are
correct?
[1 mark]
a) The light beam travels faster through glass
b) The light beam has a shorter wavelength as it passes through glass
c) The beam of light is refracted as it passes through glass
d) The beam of light is reflected as it passes through glass
7. Using the idea of particles, describe how thermal conduction takes place in a solid. [2 marks]
8. Describe what is meant by ‘the rate of energy transfer’. [2 marks]
9. Explain why you can see your reflection in a pond when the water is still, but not when it is choppy. [2
marks]
10. Explain why scientists say no energy is lost or used up when things happen. [2 marks]
11. Explain what is meant by superposition of water waves. [2 marks]
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
12. A household uses 800 kWh of electricity at 12p per kWh, and 1000 kWh of gas at 5p per kWh.
Explain what you think their bill should be. [4 marks]
13. A house is supplied with mains gas. Explain what they might use the gas for, and why scientists say
no energy is lost or used up. [4 marks]
14. Michael is fitting solar panels to the roof of his house:
They weren’t cheap to buy but he tells his neighbours he expects to “have got his money back in ten
years.” What does this mean? [2 marks]
© HarperCollinsPublishers 2014
Key Stage 3 Science Book 3 Assessments
15. Sue and Jo are buying a new electric kettle for their flat to make tea. They find a design they like but
then find out they can buy it either with a 1000W element or a 2000W element.
Sue says “We should buy the 1000W one as it will use less electricity and be cheaper to run.”
Jo says “We should buy the 2000W one as it will boil the water quicker, so energy will have less chance
to escape and it will be more efficient.”
The sales assistant says “Both kettles are the same shape, size and material so they will be as efficient as
each other. It’s just down to how quickly you want your tea.”
Who is right, and why? [4 marks]
© HarperCollinsPublishers 2014