A-LevelPhysicsPhysical quantities and units9702/12 · Oct/Nov 2010 · Q51 Mark

A quantity x is to be determined from the equation x = P - Q. P is measured as 1.27 ± 0.02 m. Q is measured as 0.83 ± 0.01 m. What is the percentage uncertainty in x to one significant figure?

A0.4%

B2%

C3%

D7%

✓ Correct answer

D: 7%

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2010 Paper 1 Variant 2, question 5.

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