Question

100 Vernier scale divisions match with 99 main scale divisions of a slide caliper. If the value of each main scale division is 1 mm, then the Vernier constant is:

• A. 1 mm
• B. 100 µm
• C. 10 µm
• D. 1 µm

Hint:

The Vernier constant is calculated by dividing the length of one main scale division by the number of Vernier scale divisions.

Answer 1

The Correct Option is C

The Vernier constant is the difference between one main scale division and one Vernier scale division: \[ \text{Vernier constant} = \frac{\text{Length of 1 main scale division}}{\text{Number of divisions on Vernier scale}} = \frac{1 \, \text{mm}}{100} = 0.01 \, \text{mm} = 10 \, \mu\text{m} \] Thus, the Vernier constant is 10 µm.