Liaison questions will vary candidate to candidate and Liaison to Liaison.
Some are very laid back, some are more in depth. The most important thing to remember as a candidate that what they are trying to do 1st and foremost is assisting you in your attempt to get an apptmt.
They are your partner in this process. They may ask questions to find your strengths and weaknesses so they will be able to fix the weakness while highlighting your strength.
Be open with them, do not hide anything because the facts will come out sooner or later, and you don't want to get behind the 8 ball because you hid things to make a better impression.
They all know you are a kid still. The same is true for the MOC board. They know you will be nervous, and accept that fact. The faster you realize this the more at ease you will be, and that will translate into a strong interview.
Just like liaison interviews, MOC interviews will also vary MOC to MOC.
Questions can be anything from the last book you read that was not assigned in class to what in your opinion is the most important asset in the military.
The latter is a loaded question...think about it, most candidates will say a specific piece of hardware. However, is that really the most important asset? Are they interviewing Lockheed for a new piece of hardware to use in the military as an asset or a PERSON to be utilized in the military?
Interview rule number 1...answer the questions for the job you are currently applying for now, not the one 2 steps down the road. You may have long term goals, and it is good to illustrate them, but to a point. I.E. you are not applying for a pilot slot, that is your long term goal. Your short term goal is being the best cadet at the SA, hence in this situation the asset is personnel and the training you will receive, regardless of becoming a pilot, your true goal is to be an Officer via an SA education.