Question

The main scale of A vernier calipers is calibrated in mm and 19 division of main scale are equal in length to 20 division of vernier scale. In measureing the diameter of a cylinders by this instrument the main scale reads 35 division and 4th division of vernier scale coincides with a main scale division find least count and radius of cylinder

Answer 1

19MSD=20VSD
1VSD=19/20 MSD
LC= 1MSD-1VSD
LC=1MSD-19/20VSD
LC=0.05 ans


diameter= mainscale reading+coinciding*reading
diameter = 35+4*0.05
diameter = 35.2