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Q.

A screw gauge has 100 divisions on the circular scale. When the head scale turned 5 times, the it moved by 2.5mm on pitch scale. The least count of the screw gauge is

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a

0.01mm

b

0.05mm

c

0.005mm

d

0.001mm

answer is C.

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Detailed Solution

Pitch of the screw= 2.5mm/5=0.5mm. 

Least count= 0.5mm/100=  0.005mm

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