Job Interview questions! Help me out OOT

[pulledagroin]

These questions sound pretty dumb to me, but I'm very inexperienced with interviews and presentations in general.

I'm going to an interview where I have to make a 10 min Powerpoint presentation. After that is the normal behavioral/techincal stuff.

1) Do I do my presentation and interview with my suit/sport jacket on or take it off?

2) I've talked to one person who has been accepted for this position in the past. Apprently they will ask some technical questions which I don't know, because they involve an elective course I didn't take in school. I'm planning to learn as much of the material as I can, however, should I be honest and say I do not have much knowledge yet in this area? then try to answer the questions as best I can? How do I approach this situation?