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Standard VIII

Mathematics

Screw Gauge

The diameter ...

Question

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

0.4

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0.8

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4

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5

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Solution

The correct option is A $0.4$
Least count of screw gauge = $\frac{0.5}{50} = 0.01 mm$

Percentage error in diameter = $\frac{0.01}{2.50} \times 100 = 0.4 %$

$∴ (a)$

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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

The correct option is A 0.4Least count of screw gauge = 0.550=0.01 mm Percentage error in diameter = 0.012.50×100=0.4% ∴ (a)

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

The correct option is A $0.4$
Least count of screw gauge = $\frac{0.5}{50} = 0.01 mm$

Percentage error in diameter = $\frac{0.01}{2.50} \times 100 = 0.4 %$

$∴ (a)$