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. (a) `0.02mm`
B. (b) `0.05mm`
C. ( c ) `0.1mm`
D. (d) `0.2mm`

Answer 1

Correct Answer - D
(d) `20` division on the vernier scale
`=16` divisions of main scale
:. `1` division on the vernier scale
`=(16)/(20) divisions of main sacle = (16)/(20 xx 1mm = 0.8mm`
We knoe that least count = 1MSD - 1VSD`
`=1mm - 0.8mm = 0.2 mm`