Question

The smallest division on the main scale of a vernier callipers is 1 mm, and 10 vernier divisions coincide with
9 main scale divisions. While measuring the diameter of a sphere, the zero mark of the vernier scale lies
between 20 and 21 mm and the fifth division of the vernier scale coincide with a main scale division. Then
diameter of the sphere is
(A) 20.5 mm
(B)21.5 mm
(C) 21.50 mm
(D) 20.50 mm​

Answer 1

Answer:20.50mm

Explanation:

Actual reading=main scale reading+vernier scale reading×least count=20+5×0.1=20.50 mm

Thank you!