O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2019 · Q201 Mark

A syringe containing air is sealed at one end. The piston is free to move. The air is heated. What happens to the average distance between air molecules and the density of the air?

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Aincreases (average distance) decreases (density)

Bincreases (average distance) stays the same (density)

Cstays the same (average distance) decreases (density)

Dstays the same (average distance) stays the same (density)

✓ Correct answer

A: increases (average distance) decreases (density)

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 20.

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