The pitch of a screw gauge is 1 mm and there are 100 divisions on the circular scale. While measuring the diameter of a wire, the linear scale reads 1 mm and 47th division on the circular scale coincides with the reference line. The diameter is:

Model Answer & Options

Source: Extra Practice

1.47 mm

1.047 mm

1.0047 mm

1.47 cm

Explanation

Least Count (LC) = Pitch / No. of divisions = 1 mm / 100 = 0.01 mm. Diameter = Main Scale Reading + (Circular Scale Reading × LC) = 1 mm + (47 × 0.01 mm) = 1 + 0.47 = 1.47 mm. 1.047 mm and 1.0047 mm are errors in LC calculation. 1.47 cm uses incorrect units.

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