A-LevelPhysicsPhysical quantities and units9702/12 · Feb/Mar 2021 · Q41 Mark

A micrometer screw gauge is used to measure the diameter of a copper wire. The reading with the wire in position is shown in diagram 1. The wire is removed and the jaws of the micrometer are closed. The new reading is shown in diagram 2. What is the diameter of the wire?

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A1.95 mm

B2.45 mm

C2.59 mm

D2.73 mm

✓ Correct answer

B: 2.45 mm

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2021 Paper 1 Variant 2, question 4.

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