In 1st round it's varies for student to student in my case inyerviewer first asked about me to tell me about your self. After that as I am ece student he started to ask about the core branch questions. Describe about the 8085 microprocessor pins, 8085 is how much bits infrastructure. What are the gates etc. After that he asked about few oops concepts what is function overloading, function overriding what's is pillar of oops. He asked me to code it down the function overloading. After that what is constructor in c++ and code it down. Than asked about 1 Puzzle which I answered. I answered almost all questions correctly except that 8085 pins question so I am not selected for the 2nd round 😀 Round 2,3 my friend's questions validate the sudoku, solve the sudoku without using backtracking, sorted number are given with ' ' in between find target, oops concepts, lot of puzzles. I think that I am bit unlucky but everything happens for good cause.
