NVIDIA Physical Design interview questions

I applied through an employee referral and then after 4-5 days got call from HR about first interview. In total there were 3 technical rounds of interview and took about a month for the final result to be out. The basic VLSI concepts like latchup, sub-threshold etc were asked.

Campus recruiting, submitted my resume and did a quiz related to VLSI that afternoon. Got a email for setting up an phone interview 3 weeks later. There were two physical design design teams I talked to. One is asking basic VLSI questions related to CMOS and timing, as well as some very simple c++. Second team is very focused on my resume and asked a lot of questions related to power gating, clock gating, CTS, etc. I got the second phone interview a week later and the guy asked some more basic VLSI questions and also asked some scripting questions, I chose Perl related questions, also very basic.