Question

The diameter of a wire is measured with a screw gauge having 50 divisions on a circular scale and by one complete rotation of circular scale, the main scale moves 0.5mm. If the reading of the screw gauge is 0.250 cm. The minimum percentage error in the reading will be
0.8
5
0.4
4



plz give the correct answer fats

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Answer 1

The correct option is (A) 0.4

We are given that:

• Number of divisions on screw gauge = 50
• Distance covered by the main scale = 0.5 mm
• Reading on the screw gauge = 0.25 cm

Solution:

• Least count of screw gauge =  0.5 / 50
• L.C = 0.01 mm
• Percentage error in diameter =  0.01 / 2.50 × 100
• Percentage = 0.4 %

Thus, the correct option is A 0.4

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