in future I want to research on "gravitational physics " and in which brach in btech I have to prefer...???
Hi
Since you are sure about pursuing research in the future, I suggest you should go for B.Tech in Engineering Physics. the branch has immense scope in research, especially in the field of modern physics. Please have a look at the following link, this will clarify all your doubts
https://engineering.careers360.com/articles/engineering-physics-0
Hope this helps!