For those who are being driven mad by this enforced period of time off work here is a website which could provide a little diversion:

Link: Quizly

You can try the questions without signing up but, obviously, it won't keep track of how you get on. I have signed up and I have got past level 8.

Typically 10 to 50 points for correct answers to questions and up to 100 points for setting a question.