thread I don't know
because the only response they're going to get is "I'm sorry I can't help you with that, it's an exam"

I had another asking me what a certain word meant, as they hadn't come across it before. The question was literally asking them to define it.

We also have sticky foldover strips on the answer sheets so that we can't see the names while we're marking. It's amazing watching a room of soon-to-be-engineers struggling with peeling off a bit of plastic and folding a flap.