M.Tech Mechanics

Parth, the tests conducted by the universities for admission to UG and PG courses are based on the same pattern/ format as national level tests (JEE, GATE, etc)meant for admission to UG and PG courses. Prepare for NIRMA university's test the way you prepare for national level tests.
In case you are not able to clear it, you can apply in other private universities where direct admission is possible or there are other universities too conducting their own test.

It is a very niche and narrow area of specialisation. You may get job with IPR law firms, MNC R&D Patent departments etc. Less Jobs are avail but jobs in field very high paying.

you can choose thermal engineering or manufacturing or production or machine design etc in m.tech. All are specific in their own field so focus on good colleges instead of branches. Try to get IITs.

mechanical in cad cam is quit good go for it

You can either pursue a MBA in Energy management or pursue M.Tech followed by a P.hD in renewable energy.
Since, renewable energy is a new field, I am not sure if a correspondence MBA program with that specialization available in India
Internationally a lot of options are available in the said area.

Except for faculty positions in Colleges and Schools, Mechanical Engineering AMIE is considered equivalent to B Tech. AMIE is a voluntary professional membership offered by Institution of Engineers(India) and is not considered as a distance education programme.

Thanks Aniket.
It is beyond my comprehension that one can do UG in mechanical and PG in electrical branch of engineering. As far as I know, it is not possible at least in any AICTE approved college.
secondly, after doing UG and PG in engineering, one should pursue Ph.D. in engineering or technology. In India, Quantum or Atomic Physics both do not fall under these categories and they come under science category. Therefore, even if somebody does so he would receive Ph.D. (science) not Ph.D. (engineering)

Dear Arun. If you mean campus placement. Yes, we do have for M.Tech Mechanical.