Microsoft Intern interview questions

I submitted my resume at an info session on campus, and was contacted within a week or so to schedule an interview. The interview lasted 30 minutes and I had one design question: design a doorbell for the future. She also asked what the hardest technical problem I'd ever had.

got this on campus job fair. One interview after 2 days. Then on-site interview two month later. The on-site is 4 round, just half day. After that we eat lunch.