Question

Circular divisions = 50, pitch = 0.5 mm. Find diameter.

• A. 2.25 mm
• B. 2.20 mm
• C. 1.20 mm
• D. 1.25 mm

Hint:

Total reading = MSR + (CSR × LC).

Answer 1

The Correct Option is C

Understanding the Concept: \[ \text{Least count} = \frac{\text{pitch}}{\text{divisions}} = \frac{0.5}{50} = 0.01\,mm \]

Step 1: Reading
From diagram: Main scale = 1 mm
Circular scale $\approx$ 20 divisions \[ \text{Total} = 1 + 20 \times 0.01 = 1.20\,mm \] Final Answer: \(1.20\,mm\)