3. Can a mortal ask a question that God can't answer?

As odd as this might sounds to you, the answer to this question is, "Yes." God is a God of order. If you ask him a nonsense question that has no answer, then of course He will be unable to answer it.

If I were to ask God what a square circle was, there would be no absolutely true answer. A square and a circle are two different classes of objects, and you cannot have a mix of the two. A circle cannot be square, and a square cannot be a triangle. The objects may be able to have certain characteristics of the other, but it still isn't both objects. That's the way God created things, and that's the way we classify them. Being two things at once (i.e. completely human and completely fish) is impossible.  Only Jesus has been able to defy this law by becoming both man and God.