Question

Two full turns of the circular scale of a screw gauge cover a distance of `1mm` on its main scale. The total number of divisions on the circular scale is `50`. Further, it is found that the screw gauge has a zero error of `- 0.03mm`. While main scale reading of `3mm` and the number of circular scale divisions in line with the main scale as `35`. the dimeter of the wire is
A. 3.32 mm
B. 3.73 mm
C. 3.67 mm
D. 3.38 mm

Answer 1

Correct Answer - D
Diamter `= M.S.R + C.S.R xx L.C + Z.E = 2 + 35 xx(0.5//50)+0.03 = 3.38 mm`