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Q.

Using screw gauge of pitch 0.1 cm and 50 divisions on its circular scale, the thickness of an object is measured. It should correctly be recorded as :

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a

2.125 cm

b

2.121 cm

c

2.124 cm

d

2.123 cm

answer is B.

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Detailed Solution

Least count,LC=pitchno of division=0.1cm50=0.002cm

Reading should be multiple of Least count.

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