I was taught a little 'trick' that can help in interviews. Always write down your questions in advance.

If you get to the end of the interview and when asked if you have any questions, answer "no, you've already answered them" then it can appear as if you haven't prepared any questions. However, if you have them written down then you can refer to it and then say "no, you've already answered them" but still make clear that you have prepared some questions.

As the previous commentator said, it looks bad if you go to an interview without questions.