What you're seeing are quizzes generated completely automatically from different sources of content. We've released this publicly as a beta so we can get feedback from others on how well the quizzes are generated and how we can improve them further.
The quizzes themselves are being generated using natural language processing, from the field of artificial intelligence, which tries to understand sentences and turn them into randomly generated quizzes.
Please know that there will be issues with the system since it is in beta, particularly in the topics of quizzes shown due to how the system automatically sources these. Some quizzes may have offensive topics or images but we are working on filtering these out of the system where they should not be.
Thanks for being a part of the beta and helping us improve our system, which in turn we hope will one day help educate and entertain many others.
If you have any feedback or concerns, please don't hesitate to contact us at firstname.lastname@example.org.