If the screw on a screw – gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is :
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a
0.001 mm
b
0.001cm
c
0.01 cm
d
0.02 mm
answer is B.
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Detailed Solution
Pitch=3 mm6=0.5 mmLC=pitchno.of CSD's=0.5 mm50=0.001 cm