M.Tech

There is a lot of scope.
1) You can try for GATE and if you got a high score then you can make an entry into ISRO, DRDO, etc.
2) New India Assurance Company Limited for the post of Post Administrative Officer (Scale I).
3) Bharat Sanchar Nigam Limited for the Post of Associate Server Maintainer.
4)

The salary doesn't depend on the college. Salary depends on your skills and on your placement. It depends on the company which you got after placement.

Please mention the exam you have appeared in for better assistance.

Defence Institute of Advanced Technology - DIAT
Girinagar, Haveli Pune, Maharashtra (020) 24389318, 24389411 (020) 24304021, 24304424
Courses Offered
M.Tech. (Mechanical (weapons)
M.Tech. (Automotive Engineering)
Ph.D. (Mechanical Engineering).

2-3 Lacs is the fees of the course.

If we talk about B.Tech then it is fine to do from private university but renowned, M.Tech from IITs need certain criteria for that, you have to prepare well during graduation. For B.Tech you can try for SRM University, Lovely Professional University and Amity University as you need to groom your sk

It depends on your skills and experience. However, around 5 to 6 Lacs per annum you will get after completing your B.Tech + M.Tech in nanotechnology.

No, JNU does not offer, M.Tech in civil engineering, for the list of courses, check out the link below:
https://www.shiksha.com/university/jawaharlal-nehru-university-delhi-4225/courses?bc[]=86