Question

A student finds that there are 20 divisions between the 0 mark and 1 V mark of a voltmeter. What is the least count of this voltmeter?
(1) 0.50 V
(2) 0.02 V
(3) 0.2 V
(4) 0.05 V

Answer 1

The least count of any device is given by the value measured by one single division on the scale of the device.

Total number of divisions on the scale of given voltmeter = 20

least count = $\frac{1\text{V}}{20}\text{= 0.05 V}$

Hence, the correct answer is option 4.