A-LevelPhysicsDeformation of solidsFeb/Mar 2022Paper 1 Q191 Mark

An object is stretched until it reaches the elastic limit. Which statement must describe the stress on the object when it is at the elastic limit?

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.

AIt is the maximum stress for which the object obeys Hooke's law.

BIt is the maximum stress that can be applied to the object before it has elastic deformation.

CIt is the maximum stress that can be applied to the object before it has plastic deformation.

DIt is the maximum stress the object can withstand before it breaks.

✓ Correct Answer

The correct answer is C: It is the maximum stress that can be applied to the object before it has plastic deformation.

📋 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 Feb/Mar 2022 examination, Paper 1 Variant 2.

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