Physics Spl

There are several options for B.Sc in physics if you choose to pursue higher studies. Otherwise, mere graduate degree is just sufficient for couple of govt. jobs.
You can apply for JAM (55% is minimum required in B.Sc for applying in JAM) and can go for a Masters degree from any IITs. Not only in physics but also you can apply for energy science. However, if these are the pros then the cons are that even M.Sc in physics is not enough to get a job from IITs. It's the bitter truth that once you land yourself in general science stream, the only way to survive is higher studies. Although, it is not always possible for every student due to several valid reasons but I would strictly advice you to go for PhD. During your Masters, you should apply for an internship in reputed and premiere institutes in India and abroad. This will add another feather in your resume and also, can help you to apply for Ph.D in that institute later some time. Nowadays, AICTE has some bizarre rules for selecting faculties in any institute. So, if you don't have any other options then only change your stream else continue the same flow.

Well, this totally depends on what the college says. But in general, you can opt for M.Sc physics or chemistry after doing your Bachelors in computer science provided that you did well in physics and maths for M.Sc physics and chemistry for M.Sc chemistry. That means, if you were not having chemistry subject while doing your Bachelors in computer science then you are not eligible for M.Sc chemistry. Similarly, if you were not having the physics and maths subjects then you are not eligible for M.Sc physics. Moreover, if you had those subjects doesn't confirm your eligibility, as you must score good in those subjects which vary according to the colleges.
Thank you and best of luck.