Rapid Quiz is the quickest, easiest way to create multiple choice questions, quizzes and exercises for WordPress.
Needed a simple way for a client to add simple quizzes/trivia/fun facts to pages/posts - Looked at the available options, many of which would have sent my client running for the hills exclaiming "I can't do that!"
Chose this one for it's simplicity and ease of use - had it installed and a quiz added to a post in less than 15 minutes - So Far, So Good - Thanks so much! And where's the Donation button? :)
I like this plugin because it is simple and easy to use. The only thing I am missing is multiple response (checkbox) option.