What is the least count of a screw gauge?

\frac{Pitch}{no. of division on circular scale}

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\frac{Pitch}{no. of division on linear scale}

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\frac{Pitch}{100 \times no. of division on circular scale}

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None of the above

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Solution

The correct option is A $\frac{Pitch}{no. of division on circular scale}$
The least count (LC) is the distance moved by the tip of the screw, when the screw is turned through 1 division of the head scale.
$L C = \frac{p i t c h}{n o . o f d i v i s i o n o n c i r c u l a r s c a l e}$

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