A-LevelPhysicsDeformation of solidsMay/June 2025Paper 1 Q211 Mark
A student has a copper wire and a steel wire with equal lengths and cross-sectional areas. The student hangs identical loads on the two wires. The extensions of the two wires are different. The student calculates the stress, strain and Young modulus of each wire. Which row identifies with a tick (√) the calculated values that are equal for both wires? [Table with columns: stress, strain, Young modulus and rows A, B, C, D. Row A: stress has tick. Row B: strain has tick. Row C: Young modulus has tick. Row D: stress and Young modulus have ticks.]
ARow A: tick under stress
BRow B: tick under strain
CRow C: tick under Young modulus
DRow D: tick under stress and Young modulus
✓ Correct Answer
The correct answer is A: Row A: tick under stress
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep