A-LevelPhysicsPhysical quantities and unitsOct/Nov 2024Paper 1 Q31 Mark

A solid bar has a square cross-section. Its length is measured as 50.0±0.2cm and its width is measured as 2.00±0.01 cm. These values are used to calculate the volume of the bar. What is the percentage uncertainty in the calculated volume?

Q: What is the correct answer to this A-Level Physics question?

The correct answer is D: ±1.4%.

Q: What topic does this question test?

This question tests Physical quantities and units in A-Level Physics (syllabus code 9702). It is worth 1 mark.

A±0.21%

B±0.22%

C±0.90%

D±1.4%

✓ Correct Answer

The correct answer is D: ±1.4%

📋 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 Physical quantities and units in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics Oct/Nov 2024 examination, Paper 1 Variant 2.

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