O-LevelPhysicsElectricity5054/12 · Oct/Nov 2021 · Q361 Mark

The diagram shows an LED connected in a circuit with a resistor and an a.c. power supply of frequency 2.0 Hz. Which statement is correct?

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.

AThe LED does not light.

BThe LED flashes on twice each second and off twice each second.

CThe LED flashes on four times each second and off four times each second.

DThe LED stays on all the time.

✓ Correct answer

B: The LED flashes on twice each second and off twice each second.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2021 Paper 1 Variant 2, question 36.

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