A short test that is given in class without any warning beforehand.
A pop quiz is a quiz (a short test) that your teacher gives you without any advance notice to check if you have been studying.
Mrs. Jones, an ELC teacher, is famous for giving her students a lot of pop quizzes.

This picture was drawn by a student in Ms. Hsu's listening/speaking class.
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Last modified on February 14, 2003