Physics Spl

Hello Jaswinder,
You have managed to score very well in your boards and JEE Mains. So, you should go for B.Tech only. However, considering your score, you will easily get colleges like LNMIIT, NMIT, Thapar Univ. and JIIT-Noida. You may also get lower NITs in the last phase of counselling. Check here for more insights.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hi Akshay,
I actually don't know about the college you mentioned, whether it's good for B.Sc in physics or not. But what I know is that St. Xavier's College, Kolkata is really very good for that particular course. Presently, SXCKOL is the best college rather an institute under UGC all over India with a score of 3.77 out of 4 and I am not saying this, it's according to the NAAC.
All the best.

Yes, of course, if you are passionate about it.
If you like aerospace, you can easily go for the course.

No, to pursue research in a particular field, you have to complete master in the same. or allied subject with minimum 55 percent mark and also need to qualify for Ph.D entrance exam, need to give research proposal and give interview in order to be selected. In short, you are not eligible for doing research in physics but can relate mathematics in physics research and combine the area.