O-LevelPhysicsThermal Physics5054/12 · May/June 2017 · Q201 Mark

A fixed mass of gas is enclosed in a cylinder with a movable piston. The gas is initially at pressure p₁ and has a volume V1. The temperature is kept constant. The piston is moved so that the pressure becomes p2 and the volume becomes V2. Which equation is correct?

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AP1/V1 = P2/V2

BP1/P2 = V1/V2

CP1V1 = P2V2

DP1V2 = P2V1

✓ Correct answer

C: P1V1 = P2V2

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2017 Paper 1 Variant 2, question 20.

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