What this practice covers
These questions are drawn from past CIE 9702 Physics papers and filtered to physical quantities and units. 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 physical quantities and units, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Giving the gram as the base unit of mass.
- Writing the unit of temperature as °K.
- Forgetting to cube or square the prefix, so 1 cm³ becomes 10⁻² m³.
- Treating a homogeneous equation as proof that the equation is correct.
- Saying repeating readings reduces a systematic error.
- Swapping precision and accuracy, particularly when the question gives a true value.
- Adding percentage uncertainties when the quantities are being added rather than multiplied.
- Using cos where the angle is measured from the vertical.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Physical quantities and units revision notes.