What this practice covers
These questions are drawn from past CIE 0625 Physics papers and filtered to transfer of thermal energy. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on transfer of thermal energy, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Explaining conduction in a metal only by particle vibration, without mentioning free electrons.
- Saying convection occurs in solids, or in a vacuum.
- Giving only one step of the convection chain; expansion, density fall and rising are all needed.
- Saying that warm air rises because it is lighter, without mentioning density.
- Saying radiation needs a medium.
- Saying a good absorber is a poor emitter.
- Describing insulation as "keeping the cold out" rather than reducing the transfer of energy out.
- Forgetting that the vacuum in a flask stops two processes, not one.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Transfer of thermal energy revision notes.