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Question

A screw gauge gives the following reading for measuring the diameter of a wire.
Main scale reading : 0 mm
Circular scale reading : 60 divisions
Given, that 1 mm on main scale corresponds to 100 divisions on circular scale. The diameter of wire is,

A
0.050 cm
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B
0.054 cm
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C
0.060 cm
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D
0.062 cm
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Solution

The correct option is C 0.060 cm
Main scale reading (MSR) = 0 mm
Circular scale reading (CSR) = 60 divison
Least count (LC) of the screw gauge
LC=Value of 1 main scale divisionTotal circular scale division
LC=1100=0.01 mm
Diameter (D) of wire is,
D=MSR+(CSR×LC)
D=0+(60×0.01)
=0.60 mm=0.060 cm
Hence, option (c) is the correct answer.

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