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You have two ways. First is just after B.Sc. You have two exams: IIT JAM and JEST Physics. You can give both exams. Happens in February every year. Than people who score top ranks in these exams are called for interview in iisc Bangalore. If you clear interview. You will get admission in integrated Ph.D. in iisc. , IISER, Hri, Niser etc. In this you do your M.Sc. And Ph.D. and than leave iisc after 6-7 years. In this you will get 16000rs per month in M.Sc. And 31000rs per month in Ph.D. Second is you do M.Sc. From somewhere else. Than you can give three exams GATE CSIR NET and JEST. Qualify any one of these with top rank. Under 100. Than you will get Interview call. And you will be selected as Ph.D. student in IIsc, IISER etc. You will get 31000rs every month. As a Physics student you can apply to many departments of iisc like
1. Physics department
2. Nanoscience department
3. Applied Physics and instrumentation
4. Materials engineering
5. Energy Science
6. Atmospheric and space sciences.