While you are being interviewed, remember you are also conducting your own interview. You will inevitably be asked if you have any questions at the close of the interview.  Please, unless you are truly not interested in the job, don't say no. They not only anticipate you asking questions, they want you to ask questions.  In demonstrates your level of preparation and interest level.  Most importantly, it's just another opportunity for you to shine. Understand what kinds of questions you should and shouldn't ask and why.