The term "pop question" typically refers to a surprise or unexpected question in a test or quiz. Some antonyms for this term could include: planned question, expected question, prepared question, rehearsed question, or announced question. These terms imply that the question was not a surprise or a trick, and that the person answering had time to consider or study the material beforehand. Other antonyms for "pop question" could include: open-ended question, discussion question, essay question, or reflective question. These types of questions are typically more thoughtful or nuanced, and require a more extended or subjective response from the student or test-taker.