Question

Determine the zero error and least count of vernier calipers shown below.

• A. 0.007 mm
• B. 0.07 mm
• C. 0.7 mm
• D. 0.7 cm

Answer 1

Answer: (C)

0.7 mm

$\begin{array}{c}\text{In the given question}\\ \begin{array}{cc}MSD& =1mm\\ N& =10\end{array}\end{array}$

$\text{Least count}=\frac{MSD}{N}=\frac{1mm}{10}$

$\begin{array}{c}\text{Zero error}=1-(v\cdot c\cdot D\times \text{least count})\\ \begin{array}{cc}& =1-(3\times 0.1)\\ & =0.7mm\end{array}\\ \text{where,}VCD=\text{vernier coincidising}\text{division}\end{array}$