NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics Physics and Measurement-Fundamental and Derived Units. Least Count Revision (Page 1 of 1)

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Classification of units:

  1. Fundamental units: The units of mass, length and time are called fundamental units or base units. Because they cannot be derived by any other units and all other units are derived by fundamental units.

  2. Derived units: The units which are derived by base units or fundamental units are known as derived units.

    There are some units which derived by some great scientists. Therefore such some derived units are named in honour of great scientists like unit of force is named Newton ,

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Least Count

  • The smallest value that can be measured by the measuring instrument is called its least count. The least count error is the error associated with the resolution of the instrument.

  • Least Count of Vernier Calipers is calculated as,

Vernier Calipers showing names of parts

Vernier Calipers Showing Names of Parts

In figure Vernier Calipers with names of parts are shown in the figure.

  • Suppose the size of one main scale division (M. S. D. ) is units and that of one Vernier scale division (V. S. D. ) is V units. Also l

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