Question

man is mortal make it interrogative

Answer 1

the correct interrogative sentence is :-
"Is man Mortal ?"

Answer 2

The interrogative form of man is mortal will be "Is man mortal?" or it also is "isn't man mortal?"

This is simply converting a positive sentence into a question that makes it interrogative and questionable.

The meaning of the sentence remains unchanged whiles the pattern and the format of the questions changes.