O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2018 · Q191 Mark

A 100 g piece of solid lead at room temperature is heated. After 22 s, it has all become liquid. The graph shows how its temperature varies with time. The power of the heater is 320 W. Which expression gives the specific latent heat, in J/kg, of the lead?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A(7.0 × 320) / (0.10 × 300)

B(22 × 320) / (0.10 × 300)

C(7.0 × 320) / 0.10

D(22 × 320) / 0.10

✓ Correct answer

C: (7.0 × 320) / 0.10

Oracle Prep sorts past-paper questions by topic, so you can drill Thermal Physics and see which topics are most likely to come up next.

Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2018 Paper 1 Variant 2, question 19.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content