Assertion : S.I. units are logical and coherent .
Reason : S.I. system of units is a rationalised system.

Options

A. If both the assertion and reason are true and reason is correct explanation of the assertion .
B. If both the assertion and reason are true but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is false.
D. If both assertion and reason are false.

Answer

B

Explanation

A coherent system means a system based on a certain set of basic units from which ll derived units are obtained by multiplication or division without introducing numerical factors. In S.I. system of units, heat energy , electric and mechanical energy are measured in joule (J) . But in C.G.S. system, they have different units.