Hey,
To pass in Physics,you need to pass in both Theory and Practicals individually. The minimum passing marks for Theory is 23 out of 70 and 9 marks out of 30 in Practicals. Thus,total marks is 33 out of 100.
Since,you failed in Theory so now,you can appear for compartment exam which is held in July. If you pass the compartment exam,you will be declared Paased.
Hope this helps.
Good luck.