Question

Using screw gauge of pitch $0.1\text{cm}$ and $50$ divisions on its circular scale, the thickness of an object is measured. It should correctly be recorded as-

• A. $\text{2.121 cm}$
• B. $\text{2.124 cm}$
• C. $\text{2.125 cm}$
• D. $\text{2.123 cm}$

Answer 1

The correct option is B $\text{2.124 cm}$

Thickness = M.S. Reading + CIrcular Scale Reading $L.C$

Here, $L.C.=\frac{\text{Pitch}}{\text{Circular scale division}}=\frac{0.1}{50}=0.002\text{cm}$

So, correct measurement would be integral multiple of $L.C.$

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(B\right)$ is the correct answer.