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Q.

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:

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a

0.02 mm

b

0.2 mm

c

0.05 mm

d

0.1 mm

answer is B.

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Detailed Solution

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Main scale division (MSD) = 1 mm, Vernier scale division (VSD) = 1620MSD
Least count= 1 MSD - 1 VSD
=1 mm -1620 (1 mm) = 15mm = 0.2 mm.

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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: