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Q.

A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm, the main scale reading is 5 mm and zero of circular scale coincides with 25 divisions above the reference level. If the screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is: -

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a

0.053 cm 

b

0.529 cm

c

0.521 cm

d

0.525 cm 

answer is D.

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Detailed Solution

diameter  M.S.R+L.C (H.S.R) ±correction
= 0.5+0.025+0.004
= 0.529 cm

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