O-LevelPhysicsThermal Physics5054/12 · May/June 2018 · Q181 Mark

A sealed packet containing air and a snack is purchased at an airport. The sealed packet is taken on board an aircraft. During the flight the packet becomes larger. What causes the packet to become larger?

AThe density of the air inside the packet increases.

BThe mass of the packet increases.

CThe pressure of the air outside the packet decreases.

DThe volume of the air inside the packet decreases.

✓ Correct answer

C: The pressure of the air outside the packet decreases.

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2018 Paper 1 Variant 2, question 18.

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