The questions were mostly on Resume. They will ask you to explain each project that you did (if they related to physical design). I had projects on memory design so they stressed on that. Apart from that basic transistor characteristics, how they vary with load etc. They asked me to explain PMOS functionality along with I-V characteristics, XOR gate using 8 transistors, sdf & sdc files.
Be thorough in your Resume, that's what they'll stress on and all the best!