Question

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

• A. If both the assertion and reason are true and reason is a correct explanation of the assertion
• B. If both assertion and reason are true but assertion 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 1

Answer: (B)

If both assertion and reason are true but assertion is not a correct explanation of the assertion

Answer 2

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