I got 8/10.
I take issue with the eating before swimming question, though. I got it right, but it's sort of misleading. True, it's really unlikely that eating before swimming will cause you to actually drown and they explain that, but that doesn't mean you should just toss your kids into the pool or onto a soccer field after a big meal.
After eating, your body increases the blood supply to your digestive tract, which means there's less blood available to the other parts of your body. This means that it's a little more difficult to provide hard working muscles with enough oxygen. Basically, you're more likely to develop muscle cramps during exercise because of this. It shouldn't be severe enough to make you drown, as they say, but it's still painful!
I usually have the kids wait before doing any activity that involves a moderate or high level of activity, just to be on the safe side. Muscle cramps are not fun!