Statement (A): The point of intersection of the co–ordinate axes is called origin.

Statement (B): $Q_1\cap Q_2=Q_3$

x-axis and y-axis together called co-ordinate axes. The point of intersection of co-ordinate axis(i.e., x-axis and y-axis) is called origin denoted as $\text{O}\left(\text{0,0}\right)$ 

$\therefore$ Statement (A) is true

Intersection of $Q_1$  and $Q_2$ is$\varnothing$ , not$Q_3$

$\therefore$ Statement (B) is false