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Q.

Which of the following combinations of three dimensionally different physical quantities P, Q, R can never be a meaningful quantity?

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a

PQ - R

b

$\frac{P Q}{R}$

c

$\frac{(P - Q)}{R}$

d

$\frac{(P R - Q^{2})}{Q R}$

answer is C.

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Detailed Solution

Cannot add or subtract different physical quantities.
(P-Q) in numerator is meaningless as P and Q are different physical quantities.

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