Question

15. A: A dimensionless quantity may have unit.
R: Two physical quantities having same
dimensions, may have different units.

Its an ASSERTION - REASONING Question.
If A and B both are correct and B is the correct explanation of A then mark 1.

If A & B both are correct but B is not the correct explanation of A then mark 2.

If A is correct but B is wrong then mark 3.

If A and B both are wrong then mark 4.
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Answer 1

Explanation:

2 both are correct but b is not the correct explanation of a

Answer 2

Answer:

• assertion is true because a dimensionless quantity may have a unit. eg . angle has a unit of radian.
• reason is also true as two physical quantities having same dimensions may have different units. eg. the dimension of both angular momentum and Planck's constant is [ M L^2 T^-1 ] but both have different units. angular momentum has a unit of kg-m^2/s and Planck's constant has a unit of j-s.
• so from here we can conclude that 2) is the correct option because both assertion and reason are true but reason is not the correct explanation of assertion.

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