Question

While measuring the cap of a pen using a vernier caliper, it was found to be 5.40 cm. The 5th division on vernier scale was found to coincide with a division on the main scale. The least count of the vernier calipers is 0.01 cm and zero error is -0.05 cm. then determine the main scale reading.

• A. 5.6 mm
• B. 5.3 cm
• C. 4.3 cm
• D. 2.4 cm

Answer 1

Answer: (B)

5.3 cm

$\begin{array}{c}\text{MSR}=xcm\\ \text{VSR}=\text{coinciding div.}\times LC=5\times 0.01=0.05cm\\ \text{zero error}=-0.05cm\end{array}$

$\text{Final reading}=MSR+VSR-\text{Zero error}$

$5.40=x+0.05+0.05$

$5.40-0.10=x$

$x=5.3cm$