Question

Q1. If P, Q and R are quantities with different dimensions, state which of the following can
never be meaningful ?
1) (P+Q) R
2) PQ+R
3)Q/P+R

A) (1) and (2)
B) (2) and (3)
C) (1) and (3)
D) (1),(2) and (3)​​

Answer 1

Answer:

Physical quantities having different dimensions cannot be added or subtracted.

As P, Q and R are physical quantities having different dimensions, therefore they can neither be added nor be subtracted. Thus, (a) can never be a meaningful quantity

Hope it's help you

Answer 2

Option a is correct
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