Q. A vernier callipers has $1\ mm$ marks on the main scale. It has $20$ equal divisions on the Vernier scale which match with $16$ main scale divisions. For this Vernier callipers , the least count is
A) $0.02\ mm$
B) $0.05\ mm$
C) $0.1\ mm$
D) $0.2\ mm$
Explanation
$20\ VSD = 16\ MSD$ $1\ VSD = 0.8\ MSD$ [image:image3.png] Least count $= MSD - VSD$ $= 1\ mm - 0.8\ mm = 0.2\ mm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.