A-LevelPhysicsDeformation of solidsMay/June 2015Paper 1 Q321 Mark
When a thin metal wire is stretched, it becomes longer and thinner. This causes a change in the resistance of the wire. The volume of the wire remains constant. Which graph could represent the variation with extension x of the resistance R of the wire?
A[Diagram A: R vs x graph, curve starting at positive R, increasing with an increasing gradient (concave up).]
B[Diagram B: R vs x graph, curve starting at positive R, decreasing with a decreasing gradient (concave down).]
C[Diagram C: R vs x graph, curve starting at positive R, decreasing with an increasing gradient (concave down).]
D[Diagram D: R vs x graph, curve starting at positive R, increasing with a decreasing gradient (concave down).]
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of deformation of solids 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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