Some may ask a question along these lines, "We have many terrific candidates -- why should we pick you?"
Other possibilities, "How do you feel about serving in time of war?" "Tell us about the last book you read that wasn't assigned for school?" "If you could go back in history and meet someone, who would it be and why?" "Who is your 'hero' and why?" "How did you spend your summer?"
The possibilities are endless. Unlike BGO, who must cover certain subjects (but have flexibility outside of that), MOC committees can ask whatever they want. As noted above, you really can't anticipate every question; however, many will be in line with things your BGO talked about.