Day Boy Question:

A good interview is a conversation, where both sides are engaged. The purpose is to discover if the position is a match. If the candidate asks no questions, they are missing an opportunity. It appears that either they aren't interested, or believe they already know everything to know about the position.

Don't ask questions just for the sake of asking questions. It's annoying to me as an interviewer when someone asks a question I've already answered, or is blatantly not relevant, just because they had it prepared. As Benjamin Holder suggests, ask questions that show you are genuinely interested in learning more about the job, the role, and the company. Use the opportunity to end on a high note.