O-LevelPhysicsEnergy & Work5054/11 · Oct/Nov 2024 · Q171 Mark

A wind-up radio is used in areas where mains electricity is not available.. A person winds a spring in the radio using the handle. When the spring unwinds, it makes a small coil rotate in a magnetic field. Which energy transfer is not useful for this radio?

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Aelastic potential energy → kinetic energy

Bkinetic energy → thermal energy

Cchemical energy → elastic potential energy

Dkinetic energy → sound energy

✓ Correct answer

B: kinetic energy → thermal energy

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Topic: Energy & Work, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2024 Paper 1 Variant 1, question 17.

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