M.S

You can go for the following universities according to your GRE profile:
1. California University
2. SDSU
3. University of Illinois
4. Kent University
5. Cleveland University
6. University of Colorado, Denver, etc.

There are many branches of civil engineering for Masters program. For list of branches, you should visit the institution website. However, I am providing name of some branches of civil engineering:
structural engineering
geotechnical engineering
earthquake engineering
transportation engineering
hydraulics engineering
underground structural engineering
tunnel engineering
alternative hydro energy
environmental engineering
CAD engineering
water resource engineering
highway engineering
construction planning and management engineering

You need to qualify USLME to study further after MBBS or to work in the USA.

Yes, you have the physics background, and for aerospace, physics is recommended. Score well in IELTS and GRE exam, and draft a good SOP.

Check out the link mentioned below:
http://www.google.co.in/url?q=http://www.scholars4dev.com/category/country/europe-scholarships/germany-scholarships/

Most of university in Canada is as equal reputed as India's IITs. So, if you are good in academics and don't have financial problem, you must go for Canada. You will have a bright future.
All the best.

Masters in Mechatronics is the best course in mechanical engineering, mechatronics is the study of mechanical and electronics which helps to get the best job in a company.

If you score well in IELTS and GRE , you have chances, but it's tough to get admission ,most of the applicants have good marks ,they need 75% mainly ,try to search more safer universities in Canada, like Newfoundland, York, Victoria, Laval, etc.

Hello Ankith,
If you want to study embedded systems particularly, I'll suggest you to look into Europe. Few suggestions are:
KTH Royal Institute of Technology, Sweden
TU Eindhoven, Netherlands
TU Berlin, Germany
All three have really good programs in this course.

Yes, electrical engineering has great prospects in Canadian universities, you can get jobs in renewable sector mainly.