Question

Find the zero error of the screw gauge given in the figure.

• A. $-0.02mm$
• B. $0.02mm$
• C. $0.98mm$
• D. $-0.98mm$

Answer 1

Answer: (A)

$-0.02mm$

$\begin{array}{c}\text{The screw gauge is at}98\text{at its mean position}\\ \text{i.e.}(100-98)=2\text{division behind.}\\ \text{we know that, least count of screw gauge is}\\ =0.01mm\\ \begin{array}{c}\text{If is behind the mean position}\\ \text{:. negative error}\end{array}\\ \begin{array}{cc}\text{and equal}t0=& -2\times \text{Least count}\\ & =-0.02mm\end{array}\end{array}$