The symbol of a screw gauge has 50 division for 1 revolution . The sendle advances 1mm when the screw is turned through 2 revolutions What is the pitch of the screw ? What is the least count of the screw gauge ?When the instrument to measure the diameter of a needle , the reading on the sleve is found to be 0.5 mm and on the thin bul it is found to be 24 division What is the diameter of the needle.
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