Academic question
Should you put milk in tea first or after you pour it?
This is a question that might generate debate, but it's pretty irrelevant.
Embedded question
A question inside another question
Did he ask you what you did?
What you did is embedded inside the other question, so doesn't take the word order of a question. In answer to your question about question marks, when a question is a request, some people don't use question marks, though others do.
Hypothetical question
What would happen if the Americans pulled out of Iraq tomorrow?
They aren't going to do this, so the discussion is about imaginary situation.
Leading question
How did you react when you saw him steal it?
This is a legal type of question- there is a presumption of innocence until guilt is proved, but by asking this, the questioner is implying guilt. A fair question would use a verb like 'take'.
Rhetorical question
Were Italians happy when they won the world cup?
This question needs no answer.
