Name the instrument which has the least count :
(a) 0.1 mm (b) 1mm (c) 0.01 mm.
The head scale of a screw gauge has 100 divisions and the screw moves 4 mm ahead in four rotations of the circular head. The pitch and the least count are respectively
The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned through two revolutions. What is the least count of screw gauge?