is it necessary to take physics as a subject in class11-12 to persue a career in interior designing
Nope! For Interior Designing UG course, having Physics isn't compulsory. Infact, for the course of Interior Designing, students from any stream can take admission if they have secure atleast 50% marks. Although, its advisable for the students to have Mathematics in 10+2 but its not compulsory.
I would also recommend you to visit the official website of the college you are interested in & check its eligibility criteria as well (sometimes the eligibility may differ).
For more information regarding Interior Designing you can consider the link provided below:
https://www.careers360.com/courses/interior-design-course
I hope this helps. Wish you a great day!