Question

what is meant by least count of an measuring devices? ​

Answer 1

Explanation:

In the science of measurement, the least count of a measuring instrument is the smallest and accurate value in the measured quantity that can be resolved on the instrument's scale.

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Answer 2

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Measuring devices such as vernier calliper, screw gauss and more have their particular least count.

Least count of a measuring device is the smallest length or quantity that the device can measure.

For example the least count of a general vernier calliper is 0.1mm.

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$\maltese \: \blue{\mid{\underline{\overline{\textbf{Vernier Callipers }}}\mid}}$

Vernier calliper is a measuring instrument which is a combination of two scales, a main scale and a vernier scale. These two scales slides over each other. This combination makes a measuring device whose least count is less than least count of main scale.

In a general vernier calliper the number of main scale divisions is Number of vernier scale divisions - 1. A vernier calliper consists of four jaws in pairs of two. Called Internal jaws and external jaws.

External jaws of a vernier calliper is used to measure outer diameter of an object and Internal jaws are used to measure inner diameter of an object.

The least count of a given vernier calliper can be calculated by the formula :-

Least count = 1M.S.D - 1V.S.D

And for an object the diameter either inner or outer can be calculated by the formula :-

M. S. D + n × L. C

Here n is the number of vernier scale division with coincides with main scale division.

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BY SCIVIBHANSHU

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