B.Sc.

You can take admission in the course provided the colleges have still seats left for the same. If the college or university is providing admission still yet, if admissions are still open then sure you can take admission. Just check out the colleges nearby you and look if the admissions are still open and if you can apply. All the best.

Hello MD
Kindly use this link for know about the eligibility.
https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/course/b-sc-in-hospitality-and-hotel-administration-institute-of-hotel-management-catering-and-nutrition-delhi-library-avenue-pusa-90908
Regards

Yes, It is possible!

I don't know about the other two colleges but yes Chitkara University is a very good college for pursuing this course! Apart from the excellent academics, the infrastructure is very good. They provide very good exposure to the students!

As of now, there is no specific PG Diploma offered by IGNOU related to physics. So you can go for any PG Diploma as per your choice and interest. Also, remember your potential while choosing because there are numerous examples. If talking about the scope I would suggest journalism and Mass Communication and Information Security have good job perspectives. Good Luck.

No, there is no option to change university after the first year, you have to retake admission from start point.

Visit this link
https://www.shiksha.com/science/course/b-sc-in-mathematics-hons-netaji-subhas-open-university-bhawanipur-Kolkata-110866

With this much rank, there is almost no chance for you to get any college, you can log in to the Shiksha predictor for a more good result:
https://www.shiksha.com/b-tech/resources/jee-main-rank-predictor