Question

What is the least count of vernier caliper?

• A. $0$
• B. $0.01mm$
• C. $0.001$
• D. $0.1mm$

Answer 1

The correct option is D

$0.1mm$

1. The least count of the vernier caliper is $0.1mm$.
2. Mathematically;7$LC=(1-\frac{n-1}{n})MSD$, where $LC$ is the least count of vernier caliper, $n$ is the number of divisions and $MSD$ is the main scale reading.
3. $LC=1-\left(\frac{9}{10}\right)=0.1mm$
4. When $n$ divisions of the Vernier scale get to coincide with the $(n-1)$ divisions of the main scale, then this is the least count of vernier caliper.

Hence, the correct answer is option (D).