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If P, Q, R are physical quantities, havi...

If P, Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity ?

A

`(P-Q)//R`

B

`PQ-R`

C

`PQ//R`

D

`(R+Q)//P`

Text Solution

Verified by Experts

The correct Answer is:
A, D
In this question, it is given that P,Q and R are having different dimensions, hence they cannot be added or subtracted, so we can say that (a) and `(e)`are not meaningful. We cannot say about the dimension of product of these quantities, hence (b),`(c)` and (d) may be meaningful.
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