Quite a common ploy in job interviews of all kinds is to ask a question for which there is no ideal answer. Something like.. If you were forced to choose, would you rather shoot your mother or your father? The interviewer isn't always interested in the answer, just how well you communicate and how confident you are in expressing your opinions. After giving your answer try asking what they would do in that situation.. . . .When I was looking for a my first job as an electronics engineer I was asked:
a) What I would do if I found a dead swan in the road. (I believe the correct answer is to notify the police because all swans are property of the Queen).
b) Were there any interesting stories in the news papers today? (You know all about the new ATC center don't you?).
I done my share of interviewing job applicants and there is nothing worse than someone who doesn't ask the interviewer any questions. Go prepared with some even if you think you already know the answers. One of the best questions to ask the interviewer: Why do they work for xyz?
Good luck.