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

Options

A. `((P-Q))/(R)`
B. `PQ-R`
C. `(PQ)/(R)`
D. `((PR-Q^(2)))/(R)`

Answer

A

Explanation

Physical quantities having different dimesions cannot be added or subtracted.
As P,Q and R are physical quantities having different dimensions, therefore tthey can neither be added nor be subtracted Thus, (a) can never be a meaningful quantitity.