Fundamentholfundamenthol
JEE Main2026Jan 28, Shift 1Physics
Q.

When both the jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4 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 division of vernier scale coincides with a min scale division. Measured length of cylinder is _______ mm. (Least count of Vernier calliper = 0.1 mm)

  1. A

    15.4

  2. B

    15.1

  3. C

    15.5

  4. D

    15.9

Solution

Zero error (positive, since vernier zero is to the right of main scale zero when jaws touch): mm.

Observed reading: MSR + VSRLC mm.

Corrected length = observed zero error mm.

Option (2).

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