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Question

Explain the term ‘least count’ of a screw gauge. How is it determined?

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Solution

The least count (L.C.) of a screw gauge is the linear distance moved by its screw along the main scale when the circular scale is rotated by one division on it.
L.C=Pitch of screw gaugeTotal number of divisions on circular scale

If pitch of a screw gauge is 1mm and the circular scale has 100 divisions, then

L.C = 1 mm100=0.01 mm=0.001 cm

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