Q.

A vernier calipers which is used to measure length of a cylinder has 1 mm marks on the main scale. It has 10 equal divisions on the vernier scale which match with 8 marks of main scale. If main scale reading is 4 and vernier is 5 then the length of cylinder is 1.25 N×10−3 m then the value of N is:

Moderate

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a

4

b

6

c

8

d

3

answer is 1.

(Detailed Solution Below)

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Detailed Solution

10VSD=8MSD1VSD=810MSD Least count =1MSD-1VSD=1−810=0.2mm Length =4+5×0.2=5.0mm1.25N×10-3=5.0×10−3m.N=4

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