Many, many job interviews have a version of role-play that they use for interview questions. In the most general sense, it's a "What would you do in this situation?" kind of question. It's strongly related to the whole behavioral interview process. Hiring managers want to get a better picture of what life will look like when you're on the job.
In sales jobs of all kinds, the stereotypical question is "Can you sell me this pen?" (One of the most hated job interview questions...)
Because there are so many different kinds of sales jobs, and because this particular situation gives you a good idea of the thought process of hiring managers who want to incorporate role play in the interview, I'm going to go through the process of "selling a pen" to the hiring manager in the video below.
If you want to get serious about preparing for interview questions, practice role-playing them with an interview coach so you'll be ready for anything.