Physics is an important filed in many industries, and hence there is a great demand for students who have done a post-graduation from a top college like IIT or NIT from Physics or related fields.
Students pursuing B.Tech or B. E. in any field or M.Sc. in Science related subjects can appear for the Physics paper, as long as they match it with the entry criteria to the M.Tech specialization of their choice. The test covers 5-6 major subjects: Mathematical Physics, Classical Mechanics, EMT, Quantum Mechanics, Atomic and Nuclear Physics, Solid State Physics, etc. It also tests students on General Aptitude.
Students who qualify in the GATE exam can apply to these colleges.