Hello dear student,

As you said you have obtained 50 rank in the exam which is your general rank so there  are very good and high chances that you get a seat for PET physics.  As the expected cut off rank for this exam for general category is expected as 267-278 . I hope this is helpful. For your further reference I am attaching a link and it will be helpful .

https://university.careers360.com/articles/bhu-pet-cut-off

Thank you