Hello P.Rajendran, hope you are doing well!

I think you want to know which course is better amongst BSc computer science and BSc electronics.

If you go with BSC in electronics or computer science you need to see if your university syllabus has physics and mathematics as electives in their syllabus. Because if you have those subjects as major in these courses, then only you will be eligible for appearing IIT JAM. On the other hand, going with BSc Physics with computer science major helps you in clearing IIT JAM as you will learn most of topics which are required for MSC Physics. So this appears as a better option. But BSc electronics will help on that context if you want to appear IIT JAM unlike BSc Computer Science.

If you don't appear IIT JAM(i.e if you are not interested in higher studies further) then I would suggest to go with BSc computer science. It will help in getting into IT field or you can even go with higher studies in similar domains abroad. And the scope is good both in India and abroad

Hope this helps:)