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Screw Gauge

Which of the ...

Question

Which of the following is the most precise instrument for measuring length?

Meter rod of least count

0.1

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Vernier callipers of least count

0.01

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Screw guage of least count

0.001

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Data is not sufficient to decide

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Solution

The correct option is D Screw guage of least count $0.001$ cm
Screw guage of least count $0.001$ cm is most precise instrument for measuring length as a device with minimum least count is more suitable for measuring length.

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On the basis of details given about two measuring instruments, select the correct statement:

(i) Vernier callipers having main scale division = 0.05 cm and vernier scale division = $\frac{2.45}{50}$ cm

(ii) Screw gauge having pitch 0.5 mm and its circular scale has 50 divisions

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