Hey Shubham, 

                          You can not pursue M.SC in Physics because you are not eligible for this course. B.SC in Physics is the eligibility criteria to take admission in M.SC (Physics).

Hi Shubham,
Yes you are eligible to do masters in physics after becoming an graduate in any of the stream!!
Reason are as follows:
1. Candidates must hold a Bachelor's Degree or equivalent qualification of any of the Universities incorporated by an act of the central or state legislatures in India or other educational institutions established by an act of Parliament or declared to be deemed as a University under section 3 of UGC Act, 1956, or possess an equivalent qualification recognized by the Ministry of HRD, Government of India/AIU. This degree must entail a minimum of three years of education (10+2+3 system) after completing higher econdary
schooling (Class 12 or equivalent).
2. Candidates of b.sc / B.A. Honours must have minimum 55% marks in average (45% for SC/ST) in their Honours subject. Candidates of other graduate courses must have minimum 55% marks in average (45% for SC/ST) in graduation, marks to be computed as average of marks obtained in ALL subjects in which candidate has appeared (excluding optional
subjects).
All the best!!