A-LevelPhysicsDeformation of solidsOct/Nov 2021Paper 1 Q221 Mark

A length of metal wire is attached to a fixed point and hangs vertically. Masses are then suspended from the wire. Assume that the cross-sectional area of the wire remains constant. [Figure 22.1] A stress-strain graph for the wire is plotted, as shown. [Figure 22.2] What is represented by the shaded area under the graph?

Q: What topic does this question test?

This question tests Deformation of solids in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Astrain energy in the wire

Bstrain energy in the wire / cross-sectional area of the wire

Cstrain energy in the wire / original length of the wire

Dstrain energy in the wire / original volume of the wire

✓ Correct Answer

The correct answer is D: strain energy in the wire / original volume of the wire

📋 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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About This A-Level Physics Question

Topic

This multiple-choice question tests Deformation of solids in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics Oct/Nov 2021 examination, Paper 1 Variant 2.

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