The least count of the main scale of a screw gauge is 1 mm
PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements
Problem
The least count of the main scale of a screw gauge is 1 mm. The minimum number of divisions on its circular scale required to measure 5 μm diameter of a wire is:
(1) 50
(2) 200
(3) 100
(4) 500