A really interesting article in the New York Times outlines how the side of a legal battle that receives more questions during a case tends to lose. Despite the lack of scientific studies, this is idea quite interesting. As you might recall from your university days, correlation is not causality.
Logically, the weaker side of an argument should receive more questions and usually one would expect the weaker argument to lose. So, does receiving more questions simply prove you are the weaker side? In which case, the quantity of questions is a good prediction of who will lose, but not a cause.
If however, receiving more questions actually weakens your argument by potentially poking more holes in it, you had better shut up. Arguments are true until proven false, so it is no big surprise more questions leads to more defeats.