A-LevelPhysicsDeformation of solidsOct/Nov 2024Paper 1 Q211 Mark
Four solid steel rods equally support an object weighing 10 kN. Each rod is of length 2.0 m and cross-sectional area 250 mm². The weight of the object causes the rods to contract by 0.10 mm. The rods obey Hooke's law. What is the Young modulus of steel?
A2.0 × 10⁸ Nm⁻²
B2.0 × 10¹¹ Nm⁻²
C8.0 × 10⁸ Nm⁻²
D8.0 × 10¹¹ Nm⁻²
✓ Correct Answer
The correct answer is B: 2.0 × 10¹¹ Nm⁻²
📋 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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