Google has published some of their data on this and behavioral questions about teamwork (e.g. handling disagreements) are reasonable and can be valuable. Software development is usually a team activity. The rest of this post is a useful, if anecdotally sourced, guide to answering the more technical class of behavioral questions. It should include a block on follow up questions. Good behavioral interviewers, like you might find at Google or Amazon, will ask specific follow ups for each question.
See: http://www.businessinsider.com/google-laszlo-bock-interview-...