@Arthuz: interview is pretty general...not very technical questions..they ask you about your hobbies..whether you played sports in school...current news and GK..
umm..u have to be smart..good communication skills MUST..speak confidently ..and there are will be some VERY senior people from the academy and a psychologist as well...and they keep asking who influenced you to be a pilot..( they asked me this at least 5 TIMES in the 15 minute interview)...very few technical questions like "a car does not start, what could be the problem?"...there are situational questions also..like "u r a pilot n your plane gets hijacked..so what do u do..?"...n then they asked me about parliament.."how many constituencies are there?" (this was weird..but expect anything..)
and yes..if you dont know something, its best to say that you have little idea about that thing, rather than giving foolish answers...i did the same..and make sure you only talk about those hobbies that you know a lot about...they will make you elaborate on whatever you say...