Re: In order to stand a chance at winning
IIUIC, the reason why this kind of competition always asks really noddy questions is because then it's a quiz rather than a lottery; lotteries are regulated by law, quizes aren't.
I suspect that if they *didn't* check you'd answered them correctly then they might have trouble explaining to The Man that this is in fact a test of skill and not simply gambling. But that's assuming that the law makes sense (which is in itself a very dubious assumption).