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Question

Thickness of a pencil measured by using a screw gauge (least count .001 cm) comes out to be 0.802 cm. The percentage error in the measurement is :

A
0.125%
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B
2.43%
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C
4.12%
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D
2.14%
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Solution

The correct option is B 0.125%
Least count screw gause is =0.001cm

The error will be thickness, t=0.802±0.001

Δt is 0.001cm

Percentage error =Δtt×100%

Percentage error =0.0010.802×100%

Percentage error =0.125%

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