A-LevelPhysicsD.C. circuitsOct/Nov 2012Paper 1 Q381 Mark
A light-dependent resistor R has resistance of about 1 MΩ in the dark and about 1 kΩ when illuminated. It is connected in series with a 5 kΩ resistor to a 1.5 V cell of negligible internal resistance. [Figure showing circuit with LDR and fixed resistor] The light-dependent resistor is illuminated (in an otherwise dark room) by a flashing light. Which graph best shows the variation with time t of potential difference V across R?
A[Graph option A]
B[Graph option B]
C[Graph option C]
D[Graph option D]
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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