Question

In a vernier calipers, ten smallest divisions of the vernier scale are equal to nine smallest division on the main scale. If the smallest division on the main scale is half a millimeter, then the vernier constant is :

• A. 0.5 mm
• B. 0.1 mm
• C. 0.05 mm
• D. 0.005 mm

Answer 1

Answer: (C)

0.05 mm

$10VSD=9MSD,1VSD=\frac{9}{10}MSD$

Vernier constant $=1MSD-1VSD$
$=(1-\frac{9}{10})MSD=\frac{1}{10}MSD=\frac{1}{10}\times \frac{1}{2}=0.05mm$