I dont think any question was difficult to answer. But mostly questions are asked based on what you have mentioned in your CV. SO its always a best policy to mention only those stuffs which you are pretty aware of. Also they mostly ask about the live environment you have worked on with pragmatic approach. For an automation/performance profile one may be asked to write a code or to explain on telephone/Skype. Overall very polite panel of interview session. Note - Clearly accept if you dont know any question instead of fumble around/or beating around the bush.
