If you want to go for M.Tech through Gate then your B.Sc should be of 4 years.

After bsc physics, you have ample opportunities to get ahead in your field.

Master of Science (M.Sc) courses are offered in areas mentioned here-

Physics

Applied Physics and Ballistics

Applied Physics

Bio Physics

Engineering Physics

Geophysics

Marine Geo Physics

Medical Physics

Renewable Energy

Nuclear physics

Vacuum sciences

Other Master level Courses In Physics

M.Sc. (Physics) + Certificate Program in Training & Development

Masters of Science & Technology in Geo Physics

Master of Philosophy (M. Phil) in Applied Physics

Master of Philosophy (M. Phil) in Physics

PhD Courses in Physics