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  4. 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

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Q. 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

Physical World, Units and Measurements

Solution:

The percentage error is $\frac{\Delta L}{L} \times 100 \%$
$=\frac{0.001}{0.802} \times 100 \%$
$=0.1246 \%=0.125 \%$