Some of the commonly asked questions to a HR executive are:
~ What is your philosophy towards your work?
~ List your strengths and shortcomings
~ What feed-back have you got about your work lately?
~ What do you know about this company?
~ Give an example that can be verified, about your ability to work under pressure?
~ Have you ever fired anyone? What were your feelings thereafter?
It is important for you not to sound rehearsed or pompous. The HR Manager interviewing you should be able to see a reflection of himself and his ability to contribute to the company in you. It is very essential to come across as confident and focused.