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 division coincides with 25 divisions above the reference level. If screw gauge has a zero error of - 0.004 cm, the correct diameter of the ball is

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

1.	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 division coincides with 25 divisions above the reference level. If screw gauge has a zero error of - 0.004 cm, the correct diameter of the ball is
Answer» `0.529 cm` `0.521 cm` `0.053 cm` `0.525 cm` SOLUTION :[measurement of diameter of STEEL ball]= [ measurement on main scale] +[ measurement on VERNIER scale]+ZERO error `=(0.5+25xx0.001+0.004) cm` `=(0.5+0.025+0.004) cm` `:.` Diameter `=0.5289 cm`