There were questions on buoyancy, simply supported beams, and a situational question where you are given two straps and asked where to place them on a member to lift it safely without breaking. (I interviewed with a civil background). My aero buddies say they were giving questions on a ball rolling down a hill of some sort and were asked questions about the dynamics of it. Be sure to know all about drag, lift, and buoyancy if you are aero of course!