what if i fail in physics paper in cbse can physical education marks will be replaced
Nope. Main subject marks that is Physics Chemistry and Mathematics/Biology marks cannot be replaced by any other subjects. And if you appear for entrance exams like NEET and JEE they themselves have criterias like scoring 50% and above in all the three subjects. So you need to appear for betterment examinations in physics subject to clear your back.
Thank you.