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

Metre rod of least count

0.1

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Vernier calipers of least count

0.01

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Screw gauge of least count

0.001

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None of these

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Solution

The correct option is B Screw gauge of least count $0.001$ cm
The most precise instrument for measuring length is screw gauge
Least count of screw gauge $= \frac{P i t c h}{N o . o f d i v i s o r s o n c i r c u l a r s c a l e}$

$= \frac{1.00 m m}{100} = \frac{1}{1000} c m$

$= 0.001 c m$

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

The correct option is B Screw gauge of least count 0.001 cmThe most precise instrument for measuring length is screw gaugeLeast count of screw gauge =PitchNo. of divisors on circular scale =1.00mm100=11000cm =0.001cm

The correct option is B Screw gauge of least count $0.001$ cm
The most precise instrument for measuring length is screw gauge
Least count of screw gauge $= \frac{P i t c h}{N o . o f d i v i s o r s o n c i r c u l a r s c a l e}$

$= \frac{1.00 m m}{100} = \frac{1}{1000} c m$

$= 0.001 c m$