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The pitch of a screw-gauge having 50 div...

The pitch of a screw-gauge having `50` divisions on its circular scale is `1mm`. When the two jaws of the screw gauge are in contact with each other, `47^(th)` division of circular scale is on the reference line. When a wire is placed between the jaws. `3` linear scale divisions are clearly visible while `31st` division on the circular scale coincides with the refference line. Then

A

Zero error in the screw gause is `-0.94`

B

Zero error in the screw gause is `-0.06mm`

C

diameter of the wire is `3.68 mm`

D

diameter of the wire is `3.56 mm`

Text Solution

Verified by Experts

The correct Answer is:
B, C
As zero on the circular scale I above refference line, zero error is negative. Therefore zero correction is positive.
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