These committees are generally comprised of the superintendent of schools, the high school principal, the athletic director, and perhaps a school board member or two. Some districts bring in current members of the varsity basketball team or even parents to screen and interview applicants. I never minded interviews by committee if the extra people such as parents knew what they were talking about during the process. Candidates should be ready for a variety of issues, but the most important aspect of preparation is to gauge the group. Be ready for everything here.
Administrators are generally professional and value the applicant's reputation.
Board members, parents, and players can be troublesome, and, ironically, can put the coach in a difficult position with the professionals by asking odd specifics. My answer was that a 9th grader would have to be good enough to start or at the very least, be the first player off the bench. I survived, and got the job. I've had board members ask me to diagram plays. Of course, if the candidate can't be that arrogant, then diagramming the play is a possibility.