These should be fairly tough:
1. Which of Jor-El's official duties did he hate?
2. When the young Jor-El was cramming for his exams, what trick did he use to maximize his study time?
3. What invention of Jor-El's led to him being elected to the Science Council?
4. Jor-El was stuck in the Phantom Zone twice when the projector failed to bring him back. What two people repaired the projector on those separate occasions?
5. When Jor-El first got married, where did he work?