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Question

The screw of a screw gauge moves 4.5 mm linearly for every 3 complete rotations of the ratchet. If the circular scale of the gauge has 95 divisions, the least count of the screw gauge is:

A
0.00158 cm
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B
0.0158 cm
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C
15.8 μm
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D
1.58 μm
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Solution

The correct option is C 15.8 μm
Given: No. of circular scale divisions, N=95
The screw moves 4.5 mm for every 3 rotations of the ratchet or the circular screw head.
The distance moved by the screw for 1 complete rotation of the ratchet, p=4.53=1.5 mm.
The pitch of the screw, p=1.5 mm
Least count of the screw gauge, L.C.=pN=1.595=0.0158 mm
1mm=0.1 cm
L.C.=0.00158 cm
Also 1 mm=103 μm
L.C.=0.0158×103=15.8 μm.

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