Always be positive in all responces you give...even if you have to answer a question that has a somewhat negative responce, I follow it through with a positive! Like "why did you leave your last employer?" I will typically tell that I felt I had hit the glass ceiling on what I could do there and could not advance in my skills or gain further experience, so I chose to look elsewhere like this facility where my skills and experiences can grow and be an asset!" See...it covered the reason I left, which was they were ticking me off something fierce and took away all my benifits and put it into a better light, then basically complemented the interviewers facility! PLUS PLUS!
All questions should be handled with postives and using their mission statement and catch phrases too! I use the words teamwork, continuity, patient safety, professionalism, nursing ethics, etc. And I will quote their mission statement as to what I can do to keep that going strong!
Also, after the interview I go to my car, write a thank you note right then and there, bringing up more positives as reminders and thanks for their time. I put it into the mail box on my way home! I have gotten three jobs that way just from doing that...and they told me so (and having a resume and dressing professionally...many an employer tells me that seems to be a passing fad, and like the fact I stick with it!).
As far as questions to them, I bring up questions about hours and units, types of patients, ratios, differentials, bonuses, orientation timelines, turn over with nurses or how long nurses stay, and especially when I may call to check in and to whom about if I got the job! OH and pay! LOL!