Overall, a very good quiz. I just have a few critiques. First of all, on question #3 both "blue" and "yellow" are correct. You should also accept "half-mast" in addition to "half-staff" for question #17. Finally, you forgot to include first in question #13 (which I think you meant to, the question looks very weird as it is).
Thank you for putting time into making this quiz, though. It's really good overall
Thank you for putting time into making this quiz, though. It's really good overall