Question

A vernier scale is used in a fortin barometer. 10 VSD coincides with 19 msD and msD = 1mm and VSD is further divided in two. Least count is –

• A. .01 cm
• B. .05 cm
• C. 1 mm
• D. 0.2 mm

Answer 1

Answer: (B)

.05 cm

Answer 2

1 VSD = $\frac { 19 } { 2 \times 10 }$ MSD

LC = 1MSD – 1VSD = 1 – $\frac { 19 } { 20 }$ mm

= $\frac { 1 } { 20 }$ mm = .05 mm