Physics

Problem

P

Q

and

R

are physical quantities having different dimensions, which of the following combination can never be a meaningful quantity? (A)

\frac{PQ}{R}

(B)

\frac{P-Q}{R}

(C)

\frac{PR-Q^2}{R}

(D)

PQ-R

(A)

\frac{PQ}{R}

(B)

\frac{P-Q}{R}

(C)

\frac{PR-Q^2}{R}

(D)

PQ-R