Question
A student measured the diameter of a small steelball using a screw gauge of least count 0.001 cm.The main scale reading is 5 mm and zero ofcircular scale division coincides with 25 divisionsabove the reference level. If screw gauge has azero error of -0.004 cm, the correct diameter of theball is(1) 0.521 cm(2) 0.525 cm(3) 0.529 cm(4) 0.053 cm