O-LevelPhysicsMeasurement5054/12 · May/June 2017 · Q31 Mark

A micrometer is used to measure the diameter of a uniform wire. What is done to obtain an accurate answer?

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AMake the micrometer horizontal and then use the scales to find the reading.

BSubtract the fixed-scale reading from the rotating-scale reading.

CSubtract the rotating-scale reading from the fixed-scale reading.

DUse the scales to find the reading and add or subtract any zero error.

✓ Correct answer

D: Use the scales to find the reading and add or subtract any zero error.

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Topic: Measurement, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2017 Paper 1 Variant 2, question 3.

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