Question

Perform an experiment using a Vernier callipers of least count 0.01cm to measure the external diameter of a hollow cylinder. Take 3 readings at different position on the
cylinder and find (i) the mean diameter (ii) the absolute mean error and (iii) the percentage
error in the measurement of diameter.​

Answer 1

Main scale can measure 5.10 and 5.15

∴ Main scale division (s) =0.05cm

Also, Vernier scale division (v) =  $\frac{2.45}{50}$ = $\frac{4.9}{100}$ = 0.049 cm/div

​  

thus, least count =0.05−0.049=0.001cm

Diameter =5.10+24×0.001

                =5.124cm