O-LevelPhysicsThermal Physics5054/11 · Oct/Nov 2012 · Q201 Mark

A person cannot unscrew the metal lid of a pot of jam. The lid can be unscrewed after it has been held under hot, running water for a few seconds. Why is this?

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AThe air pressure in the jar falls.

BThe glass expands.

CThe jam melts.

DThe metal lid expands.

✓ Correct answer

D: The metal lid expands.

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2012 Paper 1 Variant 1, question 20.

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