A panel of 5 scientists who are strong in their corresponding subjects will interview you. Starting with final year project they will ask about basics of their corresponding skilled subject and goes deep if you answer well.

pretty straight forward and mostly about B. Tech subjects and projects. prepare well those thongs and it will be okay. Interviewers ask about your self and interested subjects. Asks about B.tech projects and gate score.

After the written test (questions were CS basics, number systems, OS, networks) there was an interview conducted by 5 panelists from the same field. The interview lasted for 20 minutes. They kept the questions to CS topics: C basics, DSA, algorithms, about my project, DBMS and SQL. They prompted me to answer even if I didn't know the answer. I got the position even though I didn't answer confidently for some of the questions and didn't know some topics. There is no HR interview, the technical interview is the only one.