JEE Main 2021PhysicsExperimental PhysicsMediumMCQ

JEE Main 2021 — Experimental Physics Question with Solution

JEE Main 2021 (16 Mar Shift 1)

Question

One main scale division of a vernier callipers is a cm and nth division of the vernier scale coincide with n-1th division of the main scale. The least count of the callipers in mm is :

Choose an option

Show full solutionCorrect option: D
Correct answer
D10an

Step-by-step explanation

n-1a=na'

a'=n-1an

∴ L.C.=1MSD-1VSD

=a-a' cm

=a-n-1an

=na-na+an=an cm

=10an mm

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About this question

This is a previous-year question from JEE Main 2021, covering the Experimental Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.