Question

If the ordinate of a point is equal to its abscissa; the point lies either in the first quadrant or in the second quadrant.

Answer 1

A point plotted on a graph has an abscissa or the $x$ - coordinate $\left(x\right)$ and the ordinate or the $y$ - coordinate $\left(y\right)$.
If the ordinate of a point is equal to its abscissa; then both $x$ and $y$ are positive or negative. Hence, the point lies either in the first quadrant or in the third quadrant.

Therefore, the statement is false.

Hence, $0$ is the answer.