hello there!

Yes of course.

You can persue PhD right after the BSc degree. But one has to be extremely good at basics of the undergraduate syllabus. He/She must have read the standard books written by well known authors.

This will definitely help facing the entrance exam conducted by the institutes.doing a masters degree will give you an overview on what PhD might look like. That will also help you in getting you plans sorted whether you really want to do PhD or not. Going for PhD soon after your bachelors degree might be difficult because the study patterns very much differ.

One can check the websites of IISc Bengaluru and TIFR Mumbai for these integrated PhD programs.

As of I know these are two prestigious institutes which offers integrated PhD programs in India.

All the best.

Hello dear,

Yes , yo can pursue Phd right after the BSc in Physics .  But you have to be extremely good at basis of the undergraduate syllabus . you have to read the standard books written by the well known authors . By this you can face the entrance exam conducted by the institutes .

Good luck !