Rationalising factor of $\sqrt{a}$ is

Rationalising factor of $\sqrt{a}$ is
  1. $\sqrt{a}$
  2. $a$
  3. $\dfrac{1}{\sqrt{a}}$
  4. $a^{2}$

Solution

$\sqrt{a} \cdot \sqrt{a} = a$ (rational for rational $a$).

Asked in: MH-SSC-9

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