Note: You are currently viewing documentation for Moodle 2.4. Up-to-date documentation for the latest stable version of Moodle may be available here: Questions FAQ.
If I change a question in the question bank, will it be changed in all the quizzes?
Yes. See Tim Hunt's forum post https://moodle.org/mod/forum/discuss.php?d=234011&parent=1016542#p1016558