An interview is an opportunity for someone to get to know you as a professional. Clearly, yes or no answers aren't going to give then a lot of insight into you or your abilities.
Although they seem simple, many people find open-ended questions to be difficult to answer. Practice your responses to these sample interview questions:
1. What are your best qualities?
2. What makes you the ideal candidate for this position?
3. What would be your ideal job?