Question

Calculate the zero error for measurement done using Vernier scale calliper:

• A. $0.05cm$
• B. $-0.05cm$
• C. $0.03cm$
• D. $-0.03cm$

Answer 1

Answer: (C)

In the diagram, zero of the vernier scale lies to the right of zero of main scale. So, it has positive zero error.
$N=0,$ Third division of vernier scale is coinciding with the main scale division.
$\therefore $ zero error
$=N+3\times LeastCount=0+3\times 0.01$
$=0.03cm$
So, zero correction $=-0.3cm$
That means, actual length will be $0.3cm$ less than the measured length.