Question

The smallest division on main of a verier calipers is 1 mm and 10 verier division coincide with 9 main scale division. While measuring length of a line the zero mark pf the verier scale lies between 10.2 cm and 10.3 cm and the third division of the verier scale coincide with the main scale division then

• A. least count of calipers is 0.1 mm
• B. length of the line is 10.23 cm
• C. least count of calipers is 0.2 mm
• D. length of the line is 10.15 cm

Answer 1

The correct option is B length of the line is 10.23 cm

$\begin{array}{c}1MSD=1mm\\ 10VSD=9MSD\\ 1VSD=0.9mSD=0.9mm\end{array}$

$\begin{array}{cc}L\cdot c& =1msD-1VSD=0.1mm\\ MSR& =10.2cm\\ VSR& =\text{coinciding div}\times LC\\ & =3\times 0.1\end{array}$

$\begin{array}{c}=0.3mm\\ =0.03cm\\ \text{Final reading}=MSR+VSR\\ =10.2+0.03\\ =10.23cm.\end{array}$