I am an undergrad student with Physics Major, currently in my last year. I'm from India, and recently I have given my first interview for an integrated Ph.D. in Physics. And there are several interviews that are ahead of me.
What I need to know is this: suppose the interviewer asks a student a question, which is off-topic that is to say, rarely thought of at the undergraduate level in any of the universities. The student might simply say, "I don't have a knowledge of the topic as we haven't learned this in our undergrad course." Or there are some students who go beyond their course and learn the topic by themselves. So suppose another student gives the answer to the same question because they learned it by themself. Can the interviewer judge the students based on this question? Is there any advantage for student B to read stuff that is out of the course?