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Name the part of the vernier callipers which is used to measure the following
Thickness of a pencil.
Draw a neat and labelled diagram of a screw gauge.
Name its main parts and state their functions.
When a screw gauge with a least count of 0.01 mm is used to measure the diameter of a wire, the reading on the sleeve is found to be 1 mm and the reading on the thimble is found to be 27 divisions.
(i) What is the diameter of the wire in cm?
(ii) If the zero error is +0.005 cm, what is the correct diameter?
Which part of vernier callipers is used to measure the internal diameter of a hollow cylinder?
What is the function of ratchet in the screw gauge?
How do you account for positive zero error for calculating the correct diameter of wires?
In the following figure, the pitch of the screw is 1 mm. Calculate:
(i) the least count of screw gauge and
(ii) the reading represented in the figure.

