I just found this interactive quiz about Brazil on the Christian Science Monitor's website. There is no date given for it, so I don't know how long it's been there, but it's a fun way to check your knowledge of Brazil.
Some of the questions are really easy, some are medium, and some are very difficult.
There's a good mix of politics, history, culture, sports, and questions about demographics and crime statistics. I managed to score 26 out of 33, for an average of 79%....which I am arbitrarily rounding up to 80%.
I did better on the questions about politics, history, and culture than I did with the ones about sports and crime statistics.
The test takes about 10 minutes, depending on how fast you go, of course. After each response, you are shown if your answer was correct, and if it wasn't, the correct answer is highlighted. There is a running total of how you're doing, too.
Some of the answers were very surprising to me, but I don't want to say which ones because I don't want to give away any of the correct responses, so you'll have to go and see for yourself!
Update: The CSM has a 20-item quiz about Latin American geography, too. This is a lot easier than the Brazil quiz: I got 19 out of 20 right, and some are very easy, even for geographically-challenged North Americans.