A screw gauge gives the following reading when used to mesure the diametre of a wire.
Main scale reading : `0`mm
Circular scale reading : `52` divisions
Given that `1`mm on main scale corresponds to `100` divisions of the circular scale. the diameter of wire from the above data is :

Options

A. 0.026 cm
B. 0.005 cm
C. 0.52 cm
D. 0.052 cm

Answer

D

Explanation

Least count `= (1 "mm")/(100)=0.01 mm`
Diamter of the wire `= 0 + 52 xx 0.01 mm = 0.52 mm = 0.052 cm`