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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Physics
Chapter: Units and Dimensions

NTA Abhyas 2020 · Physics · Units and Dimensions

If P , Q and R are physical quantities, having different...

If

P

,

Q

and

R

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

Options

A $\dfrac{PQ - Q^{2}}{R}$
B $PQ - R$
C $\dfrac{PQ}{R}$
D $\left(PR - Q^{2}\right)R$

Correct answer

A. $\dfrac{PQ - Q^{2}}{R}$

Step-by-step solution

\dfrac{\left(P - Q\right)Q}{R}

Since

P

and

Q

have different dimensions, therefore, their subtraction is not possible

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