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screw gauge of pitch 0.1 cm and 50 divis...

screw gauge of pitch 0.1 cm and 50 division on circular scale measure thickness of object which of following measurement is possible for thickness

A

2.125 cm

B

2.124 cm

C

2.123 cm

D

2.121 cm

Text Solution

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The correct Answer is:
B
Least count `=(0.1 ).(50) =1/(500) = 0.2xx 10^(-2) = 0.002`
when we multiply by division no.s
it must be even because L.C is 0.002.
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