I think it really depends on what internship it is for. When I was interviewed for the Sales and Event Internship I was asked a lot of questions about my knowledge of Microsoft Office, and computers. Also why I chose to apply for that particular internship. My interview was about a half hour and I ended up getting it. Just try to let them know that you have a passion for working for them and would like to be in a specialized role, and that sort of thing. Be honest and it will be great.