Question

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 – Q²)/R

(e) (R + Q)/P

Answer 1

(a) (P – Q)/R

(e) (R + Q)/P