To create a favourable lasting impression towards the end of the interview, and assuming you are given an opportunity, it is always a good idea to have a few questions ready. Some of the good ones are;
Think carefully about what's important to you. You'll probably be allowed only two or three questions, so make the most of them.
Avoid asking questions about the salary package. If they want you they will make an offer, and then you are in a position to negotiate, depending on the circumstances.
Feel free to ask what the next step in the recruitment procedure is, but all you want to know is when you can expect to hear. Don't get involved in asking how many people applied and how many have been shortlisted.
Close proceedings by thanking the interviewer(s) for the opportunity and, if you feel things have gone really well, don't be afraid to tell them you really want the job. When an interviewer, or a panel, has interviewed a number of candidates, it's the one that makes the biggest impression that often gets the job. It sounds simple, but standing out by making such a statement could make the difference.