Although all of the above happened to him/her beware of standard answers. They are looking for honesty in your answers.
Ask yourself - these guys are looking for someone who they can sit beside on the flightdeck for a period of time, knowing they are happy that you can help them if it all turns to s%%t. If you don't know the answer don't bulls%%t them. be honest.
It seemed to have worked for me.
------------------
Never fly in anything that has the wings travelling faster than the fuselage. Like a helicopter.