Topic: Vernier calipers and screw gauge· Experimental Skills

A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero err…

A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of $-0.004$ cm, the correct diameter of the ball is

1. 0.521 cm

2. 0.053 cm

3. 0.525 cm

4. 0.529 cm

Doubtly Asked 30 Oct 2026 NEET UG 2018 Practice test neet Save WhatsApp Report

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Answer: 4. 0.529 cm

Observed reading $=0.5+25\times0.001=0.525$ cm.

Zero error is $-0.004$ cm, so the correction is $+0.004$ cm.

$$d=0.525-(-0.004)=0.529\ \mathrm{cm}$$

The correct option is 0.529 cm (option 4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero err…

1 answer

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