Hal Helms has a multiple choice quiz on his site, Are You OO-Ready. It takes a few minutes, and afterwards he gives you his answers with explanations. If you do well you can even add your name to his scoreboard.
I don’t mind admitting I only got 45.3%. Especially since Ray Camden only scored 46.9%. I haven’t done any real OOP for a few years, although I did learn it at university, and try to keep up with it when its discussed on various CF blogs.