When both jaws of vernier callipers touch each other, zero mark of… | JEE Main 2026 (28 Jan, Shift 1)

Q9JEE Main 2026 · 28 JAN · SHIFT 1Difficult

Least Count, Vernier Callipers & Screw Gauge

When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, $4$ th mark on vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and $5$ th division of vernier scale coincides with a main scale division. Measured length of cylinder is ______ mm. (Least count of Vernier calliper $= 0.1\text{ mm}$ )

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Answer: (d)

Vernier zero right of main zero: positive zero error $= +4\times 0.1 = +0.4\text{ mm}$
Observed reading $= 15 + 5\times 0.1 = 15.5\text{ mm}$
Length $= 15.5 - 0.4 = 15.1\text{ mm}$ . So the answer is (d).

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