A-LevelPhysicsPhysical quantities and unitsMay/June 2018Paper 1 Q31 Mark

A student measures the current through a resistor and the potential difference (p.d.) across it. There is a 4% uncertainty in the current reading and a 1% uncertainty in the p.d. reading. The student calculates the resistance of the resistor. What is the percentage uncertainty in the calculated resistance?

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.

A0.25%

B3%

C4%

D5%

✓ Correct Answer

The correct answer is D: 5%

📋 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 May/June 2018 examination, Paper 1 Variant 2.

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