A-LevelPhysicsPhysical quantities and unitsOct/Nov 2022Paper 1 Q31 Mark
A spring is suspended from a fixed point and a force is applied. The position of a pointer attached to the bottom of the spring against a vertical ruler is recorded. Before the force is applied, the position of the pointer is (225 ± 2) mm. After the force is applied, the position of the pointer is (250 ± 2) mm. The extension of the spring is determined. What is the percentage uncertainty in the extension?
A1.6%
B1.8%
C8.0%
D16%
✓ Correct Answer
The correct answer is D: 16%
📋 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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