To pursue research career in physics; How much physics courses should I pass in my undergraduate engineering degree? I am an undergraduate student of electronics and telecommunication engineering in a govt. college in India. But I am extremely interested in physics and mathematics. I want to pursue a research career in physics and mathematics. I generally receive suggestions like taking the GRE test. But I have the following questions:


What is the minimum amount of physics I am supposed to have mastered at the end of my engineering?
How much of physics or physics related subjects should I have in my UG course?
How much is an adequate grade (What puzzles me most is that if I am intending to do physics why should my grades in engineering should be considered?)
Cross-disciplinary movement does happen fairly frequently, particularly between engineering and the mathematical and physical sciences. Unfortunately, as the academic disciplines themselves become more cross-disciplinary, it becomes much harder to say what specific training one needs to move from one field to another between the undergraduate and graduate levels. 

A good way to check for the qualifications you are likely to need is to examine the course requirements of schools you're already interested in attending as a graduate student—if your undergraduate program has sufficient depth in math and physics to allow you to take those courses as a graduate student, then an admissions committee will likely be OK with the lateral movement. 

If you have questions about what is necessary, you can contact the person in charge of admissions at some of the departments you're interested in for further clarification.