Question

On six complete rotations, the screw gauge moves by $3\,mm$ on the main scale. If there are $50$ divisions on the circular scale the least count of the screw gauge is

• A. $0.01\,cm$
• B. $0.02\,mm$
• C. $0.001\,mm$
• D. $0.001\,cm$

Answer 1

Answer: (D)

Pitch $=\frac{3}{6}=0.5\,mm$
L.C. $=\frac{0 . 5 \,mm}{50}=\frac{1}{100}mm=0.01\,mm$
$=0.001\,cm$