Question

Q. The vernier scale of a callipers has 50 divisions which coincide with 49 main scale divisions. If each main scale division is of 0.5 mm, then minimum inaccuracy in the measurement by
callipers is
(1) 0.02 cm (2) 0.02 mm
(3) 0.01 mm (4) 0.01 cm

Answer 1

Dear student,
$$\begin{gathered} Minimuminaccuracy=leastcountofthedevice=mainscalereading-1vernierscalereading \\ now \\ 50VSR=49MSR \\ 1VSR=\frac{49}{50}MSR \\ leastcount=1-\frac{49}{50}MSR \\ =\frac{1}{50}MSR=\frac{1}{50}\times 0.5=0.01mm \end{gathered}$$
Regards