O-LevelPhysicsElectricity5054/12 · May/June 2017 · Q351 Mark

A thermistor and a light-dependent resistor (LDR) are connected in series. A potential difference (p.d.) of 6.0 V is applied across them as shown. The thermistor has a resistance of 6000 Ω in a cold room and 1000 Ω in a warm room. The LDR has a resistance of 2000 Ω in dim light and 500 Ω in bright light. When is the p.d. across the LDR equal to 2.0 V?

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Ain a cold room with bright light

Bin a cold room with dim light

Cin a warm room with bright light

Din a warm room with dim light

✓ Correct answer

C: in a warm room with bright light

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2017 Paper 1 Variant 2, question 35.

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