A-LevelPhysicsPhysical quantities and units9702/12 · May/June 2018 · 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?

A0.25%

B3%

C4%

D5%

✓ Correct answer

D: 5%

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2018 Paper 1 Variant 2, question 3.

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