Question

Least count of Vernier calliper is:
A: Maximum measurement on main scale/Total number of division on the scale
B: Minimum measurement on main scale/ total number of divisions on Vernier scale
C: Maximum count on scale/ Minimum count on scale
D: None of these

Answer 1

Hint: Vernier calliper is commonly used to find accurate values of small amounts. According to this instrument, the actual generated value would vary from the measured value and error. The error value varies with different Vernier callipers.

Complete Step by step answer: The least count of any measuring instrument is the length measured by the smallest division in its scale. When we consider Vernier callipers, we must understand that it has two scales: one is the main scale and other is the Vernier scale. Main scale is the fixed value or the fixed scale. Vernier scale is the varying or sliding scale. The least count of the Vernier scale is defined as the difference between MSD and VSD where MSD is the main scale division and VSD is the Vernier scale division.
Or we can say that the least count of Vernier callipers can be deduced as the ratio between the minimum measure on the main scale and the total number of divisions on the Vernier scale.
In other words, Least count= Minimum measurement on main scale/ total number of divisions on Vernier scale

Therefore, option B is the correct answer among the given options.

Note: Students should have proper knowledge on least count calculation of different measuring instruments since it is essential for both theory as well as practical lab examinations. The principle of finding least count in vernier scale is used in angular vernier scales to find the area.