Question

what is the least count of a standard laboratory micrometre screw gauge ​

Answer 1

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The least count of screw gauge is 0.001 cm. A micrometer may have a least count of 0.001 mm.

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Answer 2

The least count of a standard laboratory micrometre screw gauge ​is 0.001 cm .

We know ,  Least count of a screw gauge is given as :

$L.C=\dfrac{Pitch \ of\ the\ micrometer }{Total\ number \ of \ circular\ scale\ division}$     ........ ( 1 )

Here , pitch of the micrometer is the distance travelled in one whole rotation in main scale division .

In standard laboratory , Pitch = 1 mm = 0.1 cm .

Number of circular scale division , N = 100 .

Putting all in equation 1 , we get :

$L.C=\dfrac{0.1}{100}\ cm =0.001\ cm\ .$

Hence , this is the required solution .

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