I have heard the same thing that Visionary stated above (varying questions, get to know you questions). A few questions that I think are likely to come up pretty often:
-Tell me about yourself
-Tell me about your weaknesses/strengths
-Why did you apply to/why are you interested in program X
-Questions about your CAS interests
-Do you have any more questions/what else can I tell you about our program?
Notably, nothing about my research (I'd be interested to know if programs frequently ask questions about your research or if it's hard to fit in to the short interview time slots). I'd assume it also varies based on the program's interest/strength in research.