Do you have any questions for us? How to answer this question?

Never, ever say no. This will make you appear as though you learned nothing from the interview and that you are unwilling to inquire about their institution’s history or academic reputation. Do not inquire about the company’s placement records or compensation queries. Curiosity should not be viewed as a source of avarice.
When your interview is over, smile and say farewell with a thank you message. Don’t ask any inquiries that aren’t required. Keep in mind that these are the top ten questions asked during a CAT personal interview.
Your talk can last anywhere from 5 to 50 minutes. It is entirely up to you if you were able to distinguish yourself from other candidates or if you are part of the mainstream throng.