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pitch of screw gauge is 1 mm and it has...

pitch of screw gauge is 1 mm and it has 100 divisions on circular scale . There is no zero error. Thickness of a pile of 50 papers is to be found out . While measuring the thinckness of a paper it is observed that linear scale does not give any reading but `25 ^(th)` circular scale divsion coincides with reference line , thinkness of pile is -

A

15.2 mm

B

23.5mm

C

21.5mm

D

12.5 mm

Text Solution

Verified by Experts

The correct Answer is:
D
`LC=(1)/(100)=0.1 mm`
thickness of a paper `=0+25xx.01=2.5mm`
thickness ofpile `=0.25xx50=12.5mm`
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