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Q.

A screw gauge has a screw having 2 threads in  1mm. The circular scale has 50 divisions. Find the diameter of wire, if the main scale shows 6th division and the circular reads 4

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a

6.46 mm

b

3.46mm

c

6.54mm

d

3.04mm

answer is D.

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Detailed Solution

Least count=pitchNumber of divisions=0.550=0.01 mmDiameter of wire=6×0.5+4×0.01=3.04mmTherefore, the correct answer is (D).
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