Anne-Patricia,
I am not a strong advocate of pop-quizzes in any classroom setting. However, in the courses I teach, I can control when a quiz is accessible to students; from hours to days. You could certainly post one and open it from 1pm to 2pm on Thursday.
I prefer that quizzes are learning experiences in themselves. I usually allow students to take them more than once. This way they can improve their grades while they learn.
:)
Jane
