Question

The pitch of a screw gauge is 1 mm and there are 100 division on the circular head. While measuring the diameter of a wire, the main scale reads 3 mm and 55th division is in line with the base line. The area of the cross section of wire is

Answer 1

Answer:

Answer

Correct option is

D

5.22 mm

The least count of the screw gauge LC= pitch/ total number of circular divisions =1/100=0.01 mm.

The final reading or diameter of the wire D=MSR+(CSR×LC)=5+(25×0.01)=5.25 mm

As the screw gauge has positive zero error so the zero error will be subtracted from final result.

Thus, the correct vale of diameter =5.25−0.03=5.22 mm