Hello student, 

NITs are reputed institute. They have an esteemed lineage of alumni and provide great facilities for education and research. Integrated course in Physics is good but only if you are genuinely interested in this subject and want to build a career in this. This is mainly a theoretical subject, so the prospect of career is mainly in the field of academic. Pursuing a PhD in the same might help you further. You can also built a solid career in research. The average package is around  3-7 lakhs per annum. 

Cheers!