O-LevelPhysicsThermal Physics5054/11 · Oct/Nov 2019 · Q231 Mark

The diagram shows a glass flask full of water at 10 °C. A long glass tube passes through the bung into the water. The water level in the tube is at X. The flask is placed in hot water and the water level in the tube eventually rises to Y. Why does the water level rise?

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AThe flask contracts and the water expands.

BThe flask contracts more than the water contracts.

CThe flask expands and the water contracts.

DThe flask expands less than the water expands.

✓ Correct answer

D: The flask expands less than the water expands.

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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 1, question 23.

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