O-LevelPhysicsElectricityOct/Nov 2025Paper 1 Q331 Mark
A cardboard tube has two wires, P and Q, connected to its ends. Inside the tube, wire P and wire Q are connected to two resistors. The potential difference (p.d.) between wire P and wire Q is 9.0 V and the current in the wires is 0.75 A. [Figure 33.1] Which combination of resistors is inside the tube?
A0.75 Ω resistor and a 6.0 Ω resistor in parallel
B0.75 Ω resistor and a 6.0 Ω resistor in series
C20 Ω resistor and a 30 Ω resistor in parallel
D20 Ω resistor and a 30 Ω resistor in series
✓ Correct Answer
The correct answer is C: 20 Ω resistor and a 30 Ω resistor in parallel
📋 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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