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JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale. The nature of zero error involved and the least count of the screw gauge, are respectively.

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Correct option: B

\mathrm{positive, 10 \mu m}

Option B (positive, 10 μ m) is correct because the circular scale is ahead of the pitch scale, indicating a positive zero error, and the least count is calculated to be 10 μ m.

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