A Vernier calipers 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 calipers, the least count is
← IIT-JEE 2010 · Paper 2
PhysicsSingle correct+5 / -2Question 39 of 57
IIT-JEE 2010 · Paper 2, Physics question 39
Answer and worked solution
Official answer: D
Vernier division. 20 VSD = 16 MSD = 16 mm, so 1 VSD = 0.8 mm.
Least count. 1 MSD − 1 VSD = 1 − 0.8 = 0.2 mm.
(D)