I once had am interview at an HFT firm that had a very long quiz. It was too long to finish completely and accurately in the time given (about twice as long - 45 minutes for about 20 questions plus 20 follow-ups), but you were given instructions to go as quickly as possible and finish as much as you can.

Every other question, a follow up to the substantive quotation, asked you to evaluate how sure you were in the previous answer.

So a question might be a little theory or short answer or maybe asked to write code to do a simple bloom filter. The next question asked how sure you were it had no bugs or would work if all values were 4 character strings.

Probably the second toughest interview I ever went on. But I found the idea fascinating. The idea was for the quiz to test your ability to work under pressure and be able to evaluate risks in your code.