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Q.

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

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a

0.8

b

4

c

0.4

d

5

answer is A.

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Detailed Solution

east count of screw gauge $= \frac{0 .5}{50} = 0 .01 mm$
Percentage error in diameter $= \frac{0.01}{2.50} \times 100 = 0.4 %$

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