When a screw gauge is completely closed...

When a screw gauge is completely closed, zero of circular scale is 4 division below the reference line of graduation. If least count of screw gauge is 0.001 cm, the zero correction is

`-0.004 cm`

`+ 0.004 cm`

`-0.004 mm`

`+ 0.004 mm`

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The correct Answer is:

(a)

As zero of circular scale is below the reference line of graduation, zero correction is negative. Its magnitude is 4xx 0.001 cm = 0.004 cm

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