If the poser actually meant "extraneous" that is an irrelevant alien or odd question; whereas "extemporaneous" means skilled at speaking without preparation or notes and would probably make no sense as a type of question. Or would it?
A rhetorical question. It is a question in every way, but it is asked during a speech or during someone's contribution to a discussion and is not intended to elicit an answer from the hearers. It is...
A question with a question is a rhetorical question of sorts.However, the question isn't necessarily rhetorical, since it just has to be a question that includes another question (regardless of...