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Physics - Practical physics Question with Solution | TestHub

PhysicsPractical physicsMiscellaneousEasy2 minQB

PhysicsEasysingle choice

The length of an object is measured using a vernier system whose main scale is $30 cm$ long with $600$ divisions. If $19$ divisions of the main scale coincide with $20$ divisions of the vernier scale, then its least count is

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Answer:

Solution:

$∵$ Least count $= MSD - VSD$

$∵ MSD = \frac{(\frac{30}{100})}{600} = 5 \times 10^{- 4} m$

and $VSD = \frac{19}{20} \times MSD$

$= \frac{19}{20} \times 5 \times 10^{- 4} = 4 .75 \times 10^{- 4}$

$∴$ Least count $= (5 - 4 .75) \times 10^{- 4} = 0 .025 mm$

Stream:JEESubject:PhysicsTopic:Practical physicsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: QB

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