writersoul, where did you get this info? Jeopardy! is actually very accommodating of frum people– there was an online test over Sukkos a few years ago and they were flooded with complaints. They ultimately let us take the test on an alternate date. I have been taking the test for years and so far have not received “the call”.
A quick google search turns up someone’s blog. He says that he attended a taping of the show of July 18, 2007, which happens to have been a Wednesday.
shikron, yes, it is possible to study for the show. There are certain categories that are more common and one can reasonably expect to encounter them– for instance, gourmet food, ballet, opera, U.S. presidents, state capitals, and “potent potables” (alcoholic drinks).
I think it’s actually very valuable to know the information that shows up on Jeopardy! It’s always broadening to educate yourself on a variety of subjects. I was really excited when my college made it into a Jeopardy! clue recently.