Physics Spl

First of all, don't go for engineering. If you are running away from such an interesting subject like physics, then trust me, during your engineering, you are going to get some subjects, which will totally frustrate you and you would feel like why the bloody hell did you choose engineering, so just think about your interest before opting for any branch.
Think about the hurdles that you'll have to go through that particular branch for 4 years and ask yourself will you be able to come over them.
So, conclusion is that you should know about what you actually want to achieve and then act according to that.

Hi Sahil,
Your question is incomplete, you did not mention your academic profile, percentage, etc. basis which answer could be given.

Yes, you can pursue B.Sc in physics Honors after taking PCB stream.

Hi Biswal,
Be specific if you want to know for B.Sc or M.Sc abroad.

CS is better than chemistry in consideration with the ongoing market. If you choose chemistry, your chances are more in the research and teaching field.

Hello YS,
Both these branches, mechanical engineering and electrical engineering are based on the concepts of physics only. Mechanical deals with kinetics, thermodynamics, etc. while electrical deals with AC current and its applications.
So, you really need to know the basics very well and have good solving skills with conceptual clarity.