The circular scale of the shown screw gauge has 50 divisions and the screw advances 0.5 mm on the main scale in one rotation. Find the diameter of the ball. Image
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Question

The circular scale of the shown screw gauge has 50 divisions and the screw advances 0.5 mm on the main scale in one rotation. Find the diameter of the ball. Image

G1 Physics · Accepted Answer

Least count = 0.5/50 = 0.01 mm. Read the main-scale and circular-scale divisions from the figure, then apply the zero correction shown. The corrected diameter is 1.20 mm. Correct answer: C.