Hi Aaditi

There are several university/college provide integrated MSC physics course.You have to appear in the entrance exams and maintain minimum of 60% in boards.Here are the list where you can apply:

 Indian Institutes of Science Education and Research(IISER)

 National Institute of Science Education and Research (NISER)

 University of Mumbai - Department of Atomic Energy Centre for Excellence in Basic Sciences 

Indian Institutes of Technology (IITs)

Birla Institute of Technology and Science (BITS) 

Eligibility is you must pass 12th and qualify entrances like:

1.Kishore Vaigyanik Protsahan Yojana (KVPY),

2.Indian National Olympiad Examination 

3.IIT Joint Entrance Examination (JEE).

4.BITSAT(for BITS)

Good Luck and Prepare well.