The General Knowledge Quiz app for SharePoint 2013 is designed primarily to be fun, and to attract users to visit your SharePoint sites.
Engaging users to use SharePoint can be difficult. It can initially be confusing, and a steep learning curve. Anything that attracts users to stay on sites, entertains them, and helps them build confidence and see what is possible can only be a good thing.
The General Knowledge Quiz app includes over 1200 general knowledge questions. Not only that, as they are contained in a list you can add to them, or even replace them with your own - for instance it would be trivial to replace the questions with your own Health and Safety quiz.