What this practice covers
These questions are drawn from past CIE 9702 Physics papers and filtered to forces, density and pressure. 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 forces, density and pressure, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Using the distance along the rod rather than the perpendicular distance when the force is angled.
- Doubling the force when finding the torque of a couple.
- Forgetting the weight of a uniform rule, or placing it anywhere but the centre.
- Taking moments about a point and then forgetting that the same point must be used for every term.
- Saying pressure in a liquid depends on the width or shape of the container.
- Omitting atmospheric pressure when the question asks for total pressure.
- Saying a denser body experiences a greater upthrust when both are fully submerged and have the same volume.
- Converting g cm⁻³ to kg m⁻³ with a factor of 100.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Forces, density and pressure revision notes.