O-LevelPhysicsElectricity5054/11 · Oct/Nov 2011 · Q301 Mark

The current in a filament lamp is 0.25 A when working normally. The lamp is connected to a plug and the mains a.c. supply. When the lamp is switched on, it does not light. What is a possible cause for this?

AThe earth wire in the plug is not connected.

BThe fuse in the plug is 3 A.

CThe lamp only works on a d.c. power supply.

DThe live wire in the plug is not connected.

✓ Correct answer

D: The live wire in the plug is not connected.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2011 Paper 1 Variant 1, question 30.

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