1) The diameter of a cylinder is measured using a vernier callipers with no zero error, It is found that the zero of the vernier scale lies between 5.10 cm and 5.15 cm of the main scale. The vernier scale has 50 division equivalent to 2.45 cm. The 24 th division of the vernier scale exactly coincides with one of the main scale divisions. The diameter of the cylinder is A) 5.112 cm B) 5.124 cm C) 5.136 cm D) 5.148 cm Answer: Option BExplanation:1 mMD= 5.15 cm -5.10 cm=0.05 cm $1 VSD=\frac{2.45 cm}{50}=0.049 cm$ $\therefore$ LC=1MSD-1VSD=0.01cm Hence , Diameter of cyclinder = (main scale reading)+ (Vernier scale reading )(LC) =5.10 +(24) (0.001)=5.124 cm
