Question

A student measued the diameter of a small steel ball using a screw gauge of least count `1.001 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 erroof `-0.004 cm`, the correct diameter of the ball is
A. `0.529 cm`
B. `0.521 cm`
C. `0.503 cm`
D. `0.525 cm`

Answer 1

Correct Answer - a
Measured dimension of the half = Reading of serew gange
`= MSR + VSR xxLC+ "zero error"`
` = 0.5 cm + 25 xx 0.001 cm + 0.004 cm = 0.529 cm`