Angles made by 2 intersecting lines

Q. The point where two lines intersect is called

Q. Name all the angles formed by the intersection of two lines $AC$ and $BD$ at the point $O$.

1. $\angle AOB$ or $\angle BOA$
2. $\angle BOC$ or $\angle COB$
3. $\angle COD$ or $\angle DOC$
4. $\angle DOA$ or $\angle AOD$
   

Q. Two or more lines that lie in the same plane and never intersect each other are known as .

Q. How many angles are formed by two intersecting lines?

1. $2$
2. $4$
3. $8$
4. None of the above

Q.
In the diagram above $\angle 1$ and are a pair of vertical angles, whereas $\angle 2$ and are another set of vertical angles.

1. $\angle 3$
2. $\angle 4$
3. $\angle 1$
4. $\angle 2$