O-LevelPhysicsThermal Physics5054/12 · May/June 2020 · Q241 Mark

Thermal energy is used to turn water at 100 °C to steam at 100 °C. Which of the following occurs? 1 The forces between the molecules decrease. 2 The speed of the molecules increases. 3 The separation of the molecules increases.

A1, 2 and 3

B1 and 2 only

C1 and 3 only

D2 and 3 only

✓ Correct answer

C: 1 and 3 only

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2020 Paper 1 Variant 2, question 24.

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