Question

The diameter of a cylinder is measured using a Vernier callipers with no zero error. It is found that the zero of the Vernier scale lies between $5.10cm$ and $5.15cm$ of the main scale. The Vernier scale has $50$ divisions equivalent to $2.45cm$. The $24^{\text{th }}$ division of the Vernier scale exactly coincides with one of the main scale divisions. The diameter of the cylinder is

• A. 5.112 cm
• B. 5.124 cm
• C. 5.136 cm
• D. 5.148 cm

Answer 1

Answer: (B)

Main scale division $(s)=.05cm$
Vernier scale division (v) $=\frac{49}{100}=.049$
Least count $=.05-.049=.001cm$
Diameter: $5.10+24\times .001$
$=5.124cm$