JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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Application +4 | -1

The pitch of screw gauge is

1 \mathrm{~mm}

and there are 100 divisions on circular scale. While measuring diameter of a wire, linear scale reads

1 \mathrm{~mm}

and

39^{\text {th}}

division of circular scale coincides with reference line. The zero error is

-0.05 \mathrm{~mm}

. The correct diameter of wire is

View answer and explanation

Correct option: B

1.44 \mathrm{~mm}

Option B (

1.44 \mathrm{~mm}

) is correct because the correct diameter is calculated by adding the linear scale reading, circular scale reading, and the zero error.

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