A-LevelPhysicsD.C. circuits9702/12 · May/June 2012 · Q361 Mark

A light-dependent resistor (LDR) is connected in series with a resistor R and a battery. [Figure 36.1] The resistance of the LDR is equal to the resistance of R when no light falls on the LDR. When the light intensity falling on the LDR increases, which statement is correct?

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AThe current in R decreases.

BThe current in the LDR decreases.

CThe p.d. across R decreases.

DThe p.d. across the LDR decreases.

✓ Correct answer

D: The p.d. across the LDR decreases.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2012 Paper 1 Variant 2, question 36.

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