Question

In a vernier callipers having 10 Vsd the vernier constant is 0.1 mm When the jaws are closed zero of varnier lies to the left of zero of main and 7th Vsd coincides with scale division when a cylinder is placed between the jaws the main scale reading was 7.7 cm and vernier scale read 8 division What is the diameter of the cylinder ?
A. 78.1mm
B. 77.5mm
C. 77.8mm
D. 78.5mm

Answer 1

Correct Answer - A
zero error `= -(10-7) xx 0.1= -0.3` mm
`diameter =77.0+8xx0.1-(0.3)`
` =78.1` mm