First slide

Accuracy; precision of instruments and errors in measurements

Question

The diameter of a wire as measured by screw gauge was found to be 2.620, 2.625, 2.630, 2.628 and 2.626 cm. Express the result in terms of percentage error.

Moderate

A

$1.626 \pm 0.1 %$
B

$2.626 \pm 0.5 %$
C

$2.626 \pm 0.1 %$
D

$1.626 \pm 0.5 %$

Solution

Diameter of wire can be written as,
$d = 2.626 \pm 0.1 %$

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