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Hello Amal,
Frankly speaking although, Medical Electronics (which is mainly related to designing of medical equipments) will see a growth in the coming years due to the growth in health care business and new technology inventions in the area but as of now the career scope is decent and not very booming. As this is quite a new field in India, there are not many colleges offering this course. However, few of which you can check are: Dayananda Sagar College of Engineering, MS Ramaiah University.
After attaining a degree you would be able to find a job with Hospitals & various medical equipment manufacturers or after gaining some experience start your own manufacturing business.
However, I would also like to add here that if possible you should go for more evolved fields like Electrical or Electronics which will also make you eligible for medical electronics field. Also check the link below:
http://tinyurl.com/2f9pchp
I hope this answers your question to your satisfaction. If so, kindly upvote this answer. If you have any further questions, kindly revert.

In B.Tech, you have to study all the engineering subjects, But if you opt for B.Tech Hons. Then you have to study only one of the engineering subjects in more depth. So, in B.Tech you have to study all the subjects given by colleges. But in B.Tech Hons. You have to study only one subjects which you like the most and you get specialisation only in one subjects. So, according to my opinion, B.Tech Hons. Is the best option, In nowadays there is a very great demand for Hons. Degree. Choosing the best university with good placement is also important, I would recommend LPU based on my research that I have done by interacting LPU B.Tech students. Let me share few details of this programme at LPU. Good Placement: LPU has a good placement record for CSE students. Every year more than 500+ companies including national and multinational companies visit LPU for placement. A few of them are Microsoft, Amazon, Adobe, etc. In which they are placed. The maximum package availed for CSE is 42 lacs. Per annum by Microsoft in 2020. Scholarships: LPU provides scholarships to bright students every year worth crore rupees to all the students on the basis of their academics and extracurricular activities and other factors. Faculty: All faculty members are well qualified from IITs, NITs, Iims, and top-ranked universities all over the world. Tie-ups: B.Tech in CSE has tie-ups with upgrade which helps students to explore themselves more in their field. Specializations: CSE students get many specializations while studying CSE to enhance their knowledge according to their interest such as Artificial Intelligence, Machine Learning, Cloud Computing, Data Science, etc.

Hello,
Pursuing Aerospace Engineering as a specialization in Post Graduation (M.Tech) is indeed a better choice. Aerospace Engineering is a niche branch in India with limited job opportunities at present. However, since you already have completed Bachelors in Mechanical degree, you can apply for jobs in mechanical sector, whilst you can also keep looking for jobs in your desired role in Aerospace Engineering. This way, your career won't halt. While, your job in mechanical domain will keep earning you experience, you can choose your path in the Aerospace domain whenever you get a good opportunity.
I hope this answers your question to your satisfaction. If you have any further questions, kindly revert.