A student measured the diameter of a small steel ball using a screw gauge of...

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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 4 mm and that of circular scale is 25 If the screw gauge has zero error of 0 004 cm the correct diameter is 1 0 043 cm 2 0 429 cm 3 0 421 cm 4 0 425 cm

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