It was a pretty quick and informal interview with one of the members of the admissions committee. He asked why I wanted to pursue a PhD, a question specific to my SoP, what challenges I foresee encountering in graduate school, and to talk about my favorite research project. I asked about academic development opportunities, the colloquia, and department culture. Hope that's helpful!! No offers of admission during the interview, but I got an email today that the department has recommended me for admission and I'll be getting notified by the grad school soon!!