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JEE Main 2026 (5 Apr, Shift 1) · Least Count, Vernier Callipers & Screw Gauge

Least Count, Vernier Callipers & Screw Gauge question from JEE Main 2026 (5 Apr, Shift 1)

Q3JEE Main 2026 · 5 APR · SHIFT 1Medium

Least Count, Vernier Callipers & Screw Gauge

In a Vernier calipers, when both jaws touch each other, zero of the Vernier scale is shifted to the right of zero of the main scale and $7$ th Vernier division coincides with a main scale reading. If the value of 1 main scale division is 1 mm and there are 10 Vernier scale divisions, then the Vernier caliper has

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Answer: (c)

LC $= \dfrac{1\text{ mm}}{10} = 0.1$ mm
Vernier zero to the right of main zero gives a positive zero error.
Error $= 7\times 0.1 = 0.7$ mm $= 0.07$ cm
So the answer is (c) $0.07$ cm positive zero error.

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