In an experiment with vernier callipers of least count 0 . 1mm ,...

In an experiment with vernier callipers of least count

0 . 1mm

, when two jaws are joined together the zero of vernier scale lies right to the zero of the main scale and

{6}^{th}

division of vernier scale coincides with the main scale division. While measuring the diameter of a spherical bob, the zero of vernier scale lies in between

3 . 2cm

and

3 . 3cm

marks and

{4}^{th}

division of vernier scale coincides with the main scale division. The diameter of bob is measured as

Options

A $3 . 22cm$
B $3 . 18cm$
C $3 . 26cm$
D $3 . 25cm$

Correct answer

B. $3 . 18cm$

Step-by-step solution

The least count is $LC = 0 . 1mm$
Zero error $( ZE ) = 6 \times LC = 6 \times 0 . 1mm = 0 . 6mm$
The total reading is $TR = MSR + \left(VSR \times LC\right) - ZE ⇒ TR = 32mm + ( 0 . 1 \times 4 ) mm - 0 . 6mm ⇒ TR = 31 . 8mm = 3 . 18cm$

Practice Experimental Physics on Quantrex Academy →

More from Experimental Physics

Two thin wires, Wire-1 of diameter 0.650 mm and Wire-2 of unknown diameter d are given.… JEE Advanced 2026 In a Vernier calipers, when both jaws touch each other, zero of the Vernier scale is… JEE Main 2026 In a screw gauge when the circular scale is given five complete rotations it moves… JEE Main 2026 In a screw gauge the zero of main scale reference line coincides with the fifth division… JEE Main 2026 In an experiment, a set of reading are obtained as follows - 1.24 ~mm, 1.25 ~mm, 1.23 ~mm… JEE Main 2026 When both jaws of vernier callipers touch each other, zero mark of the vernier scale is… JEE Main 2026 In a vernier callipers, 50 vernier scale divisions are equal to 48 main scale divisions.… JEE Main 2026 In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal… JEE Main 2026 Full Experimental Physics list All JEE Main PYQs