A-LevelPhysicsD.C. circuitsMay/June 2014Paper 1 Q341 Mark

In the circuit shown, a light-dependent resistor (LDR) is connected to two resistors R₁ and R₂. The potential difference (p.d.) across R₁ is V₁ and the p.d. across R₂ is V₂. The current in the circuit is I. [Figure 34.1] Which statement about this circuit is correct?

Q: What topic does this question test?

This question tests D.C. circuits in A-Level Physics (syllabus code 9702). It is worth 1 mark.

AThe current I increases when the light intensity decreases.

BThe LDR is an ohmic conductor.

CThe p.d. V₂ increases when the light intensity decreases.

DThe ratio V₁/V₂ is independent of light intensity.

✓ Correct Answer

The correct answer is D: The ratio V₁/V₂ is independent of light intensity.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Physics Question

Topic

This multiple-choice question tests D.C. circuits in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics May/June 2014 examination, Paper 1 Variant 2.

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