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When a screw gauge is completely closed,...

When a screw gauge is completely closed, zero of circular scale is `7` divisions above the reference line of graduation. If `LC` of screw gauge is `10^(-3) cm`, the zero error is

A

`-7xx10^(-3)cm`

B

`+7xx10^(-3)cm`

C

`-0.007mm`

D

`+0.007mm`

Text Solution

Verified by Experts

The correct Answer is:
A
As zero of ciruclar scale is above the reference line of graduation, zero correction is positive and zero error is negative.
`Zero error=-7xx10^(-3)cm`
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