Vernier scale readings are as shown in the figures given below. Give the actual reading provided :

(a) the instrument has a zero error of +0.02 cm.

(b) the instrument has a zero error of -0.03 cm.

While measuring the length of a rod with a vernier callipers, figure below shows the position of its scales. What is the length of the rod?

The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned through two revolutions.

(i) What is the pitch of the screw gauge?

(ii) What is the least count of the screw gauge?

The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line.

Find —

1. The least count, and
2. The diameter of the wire