A-LevelPhysicsDeformation of solidsMay/June 2021Paper 1 Q191 Mark

A steel bar of circular cross-section is under tension T, as shown. [Figure 19.1] The diameter of the wide portion is double the diameter of the narrow portion. What is the value of stress in the wide portion / stress in the narrow portion?

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.

A0.25

B0.50

C2.0

D4.0

✓ Correct Answer

The correct answer is A: 0.25

📋 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 May/June 2021 examination, Paper 1 Variant 2.

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