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Question

A Vernier caliper has 1 mm marks on the main scale. It has 20 equal divisions on the Vernier scale which match with 16 main scale divisions. For this Vernier caliper, the least count is:



Your Answer
A

0.02 mm

Your Answer
B

0.05 mm

Your Answer
C

0.1 mm

Correct Answer
D

0.2 mm


Solution

The correct option is D

0.2 mm


Least count is the difference between one main scale division and vernier scale division L.C. = 1 MSD - 1 VSD

Given,

20 V.S.D = 16 M.S.D

1 V.S.D = 1620M.S.D

L.C. = 1 MSD - 1 VSD = 420M.S.D

= 15M.S.D

1 M.S.D is given by 1mm

L.C. =15×1mm=0.2mm

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