Question

A vernier calipers has `1mm `marks on the main scale. It has `20` equal divisions on the Verier scale which match with `16` main scale divisions. For this Vernier calipers, the least count is
A. `0.02 mm`
B. `0.05 mm`
C. `0.1 mm`
D. `0.2 mm`

Answer 1

Correct Answer - D
` 16 MSD = 20 VSD`
`rArr 1 VSD = 4//5 MSD`
`LC = 1 MSD - 1VSD`
`(1 - (4)/( 5)) ( 1mm) = 0.2 mm`