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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 mmB. 23.5mmC. 21.5mmD. 12.5 mm |
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Answer» Correct Answer - 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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