Nepal

Yes, There are many medical college in Nepal, but getting admission in other country is also not that easy. There are only 10 medical college in Nepal, so number of seats are also very low. Getting a top medical colleges will be your dream, if you have decided not to do you MBBS course from India. So, getting a top colleges in list of 10 is also a very difficult task.

No, it is not affiliated to Tribhuvan University. Please visit the link to know about the affiliations:
https://www.dpmc.in/affiliation.html

Hi, This course is leading to a very good career, usually B.Sc. (Nutrition and Dietetics)
3 years. (6 Semesters) is available, if you have given NEET those scores are accepted by some universities or take the universities test. There are some of the universities /institutes like Lovely Professional University, Manav Rachna International Institute of Research and Studies, Sharda University, etc. Who are providing these courses.

Aeronautical engineering will be better, as the number of opportunities will be more. Moreover, it has got more scope than in comparison with maintenance engineer.

Hi Rakesh, Please find the list the of colleges below;
1. Indian Institute of Technology - [IIT], Kharagpur
2. Birla Institute of Technology And Science - [BITS], Pilani
3. Indian Institute of Technology Madras - [IITM], Chennai
4. Indian Institute of Science - [IISC], Bangalore
5. National Institute of Technology - [NIT], Tiruchirappalli.

If you have given CET then only the admission is possible. Class 12th result is mandatory to get admission. Please visit www.ipu.ac.in for other details.
Thanks.

Yes, You can get admission in the college you want. If there is any entrances then you can to clear. If direct admission can be done, then you are eligible in NRI quota.
All the best.

Your information is very limited for a specific answer, but you can apply for undergraduate courses in Indian universities. If you can give information such as your course curriculum and interest area, it will be easier to help.

Yes, NIOS certificate is valid in Nepal. NIOS is flexible to study; it is recognised around the world.