$0$ as a rational is

$0$ as a rational is
  1. $\dfrac{0}{n}$ for any $n \ne 0$
  2. $\dfrac{n}{0}$
  3. Not a rational
  4. Only $\dfrac{0}{1}$

Solution

$\dfrac{0}{n}=0$ for any non-zero $n$.

Asked in: IMO

Practice more RATIONAL NUMBERS questions on Aicharya