There are plenty of paid plugins that let you add interactive quizzes and polls to your website. Looking for a free option that actually works? Quiz And Survey Master is worth a look. It lets you create quizzes and surveys for your visitors. You can have true/false, multiple choice, open answer, drop drown, and multiple response questions.
Questions can be assigned to different categories. They can all be shown on one page or multiple pages. Webmasters can activate quizzes on a schedule and randomize the questions. Once done, visitors can share their results on their favorite social networks.
Quiz And Survey Master is a free script. You can download it here.