Google Docs is a very cool online Office suite of apps. It includes a word processor, a spreadsheet, presentation software (like PowerPoint), and a online form creator. The form creator will allow you to create an online survey or even an online quiz for students to take. And that’s not all that Google Docs can do. As a bonus, it is all free!
There are several video tutorials on how to create these forms. Here is one on how to create a quiz.
A video tutorial that I like even better is this one that even teaches you how to set-up your spreadsheet to grade quizzes for you.