People asking newbie questions isn't really a problem, as long as there are people patient and willing to explain things to them or direct them to tutorials (even though that information is easily accessible for themselves).
This topic is complaining about noobish answers, not questions though. Giving a verbal warning seems to me like a reasonable way of making people think twice about whether they really do understand what they're talking about when they give advice. That said, you have to be careful, because it's quite possible for someone to sincerely believe something that is incorrect (e.g. the 'bottom-to-top' rule in removing units, when the 'left-to-right' rule is in fact the only rule) - and in that case, they aren't just being a noob who is posting the first thing that comes to mind.
QUOTE(Noober)
Maybe, for a question that can be found in the tutorials, have a mod or someone post "Look in the tutorials" or something like that, then close it? Will that teach them? Or will they just post the thread again until they get an answer?
People often point to tutorials as answers to questions; a lot of the time, however, someone else will simply go to the tutorial and copy/paste the material into the thread, or explain it in their own words. I think it's not normally the question-asker who pushes the question - normally simple questions are 'over-answered' even before the topic starter returns to their topic (which isn't a problem as long as the multitude of answers aren't confusing, mutually contradictory, or wrong).