Hello aspirant!
Answering your question-
Yes some of the PHYSIOTHERAPY colleges do give admission on merit basis that is on your class 12 th marks but the admission criteria differ from college to college as some colleges take their enterance test to check whether you are eligible for the college or not.
So yes it differ from college to college.

Some of the government PHYSIOTHERAPY colleges in India are mentioned  in the link below-
https://medicine.careers360.com/articles/top-physiotherapy-colleges-in-india
Hope this helps you.