1.

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. `((PR-Q^(2)))/(R)`

Answer» Correct Answer - A
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.


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