hi,

I hope you are asking about iisc 4 years bachelor of science program, if you have applied through kvpy admission channel you need to appear in interview session. in general the interviewer will not ask you very much of memory based questions, but they will definitely check your conceptions on topics of physics chemistry and mathematics and general science. below subjects are available for bs program,

Biology.

Chemistry.

Earth & Environmental Science.

Materials.

Mathematics.

Physics.

questions will be based on why you are interested for this program, what is your future goal , since it is a research based program , you need to show your confidence for learning at the interview sessions.