O-LevelPhysicsThermal Physics5054/11 · May/June 2014 · Q181 Mark

A piston is supported by gas trapped in a cylinder. A weight is put on the piston. The volume of gas supporting the piston decreases but the temperature of the gas is unchanged. What happens to the molecules?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThey hit the piston more frequently.

BThey move more slowly.

CThey have a smaller size.

DThey have more kinetic energy.

✓ Correct answer

A: They hit the piston more frequently.

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2014 Paper 1 Variant 1, question 18.

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