Question

A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : $0\, mm$ Circular scale reading : $52$ divisions Given that $1\, mm$ on main scale corresponds to $100$ divisions on the circular scale. The diameter of the wire from the above data is :

• A. 0.52 cm
• B. 0.026 cm
• C. 0.26 cm
• D. 0.052 cm

Answer 1

The Correct Option is D

Least count $=\frac{1}{100}=0.01 \,mm$ Diameter of the wire $=C S R \times L C $ $=52 \times 0.01 \,mm $ $=0.52 \,mm $ $d=0.052\, cm$