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A screw gauge has 50 divisions on its ci...

A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking , prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale . The nature of zero error involved , and the least count of the screw gauge, are respectively.

A

Negative , 2 `mu `m

B

Positive , 10 `mu ` m

C

Positive , `0.1 mm`

D

Positive , 0.1 `mu ` m

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Knowledge Check

  • A screw gauge has 1.0mm pitch and 200 divisions on the ciruclar scale. The least count of the instrument is

    A
    `5xx10^(-3)mm`
    B
    `5xx10^(-4)mm`
    C
    `5xx10^(-2)mm`
    D
    `5xx10^(-5)mm`

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    A
    `0.25xx10^(-2)cm`
    B
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    C
    `0.001cm`
    D
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  • A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale : The pitch of the screw gauge is:

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    `0.25 mm`
    B
    `0.5 mm`
    C
    `1.0 mm`
    D
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