Question

The figure of a centimeter scale below shows a particular position of the Vernier calipers. In this position the value of $x$ shown in the figure is (figure is not to scale).

• A. $0.20cm$
• B. $3.65cm$
• C. $4.15cm$
• D. $0.03cm$

Answer 1

The correct option is D $0.03cm$

At the 5th reading of vernier's scale, both readings of the scales coincide.

At the 4th reading of vernier's scale, the length between the two scales is min. and will be the least count=0.01cm

So difference at 3rd reading of vernier scale is 2$\times$0.01cm

$⟹$ difference at 2nd reading of vernier scale will be 3$\times$0.01cm=0.03cm