Are automated online quizzes effective for formative feedback to students I would like to increase my use of formative feedback (feedback showing students whether they understand material correctly without impacting their grades) and would like to integrate it with online quizzes.

I'm wondering if this has been found to be effective.

My goal is to make it simple and automated. While I could write one myself (school generally does not pay for things like this), I would prefer to avoid building it (or paying). What I'm really looking for is something like forms in Google docs but would also somehow automatically and instantly score the answer (limiting student answers to multiple choice) and displaying the results to the student as soon as the submit button is pressed.

So, this is a compound question: Does using online auto-scoring quizzes help students (I believe it will) through formative feedback and is there a way to get Google forms to give immediate results?
If your school uses any sort of online learning platform (like Moodle), they often (and I know Moodle specifically) do this.