Question

A student finds that the screw gauge that he is using to measure the thickness of a metal sheet has 50 divisions on the circular scale. If the pitch of the screw gauge is 0.05 cm, what is its least count?

• A. 0.001 mm
• B. 0.01 mm
• C. 0.025 mm
• D. 0.25 mm

Answer 1

The correct option is B

0.01 mm

We know that, Count = $\frac{\left(Pitch\right)}{(No.ofdivisionsoftheheadscale)}$

= $\frac{\left(0.05cm\right)}{\left(50\right)}$ = 0.001 cm = 0.01 mm