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Physics
If P , Q and R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?
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Q. If $P$ , $Q$ and $R$ are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?
NTA Abhyas
NTA Abhyas 2022
A
$\frac{PQ - Q^{2}}{R}$
B
$PQ-R$
C
$\frac{PQ}{R}$
D
$\frac{\left(PR - Q^{2}\right)}{R}$
Solution:
$\frac{\left(P - Q\right) Q}{R}$
Since $P$ and $Q$ have different dimensions, therefore, their subtraction is not possible