Any subject could be opted if u have aptitude and relevant knowledge base but u have to bear in mind the fact that u are nt just going to pass the exam rather fight for a better group.the issue is that physics is a technical subject and questions asked in this papers are of post graduate level so even if u have talent and confidence pass the paper you can not excel owing to ur limitation in ur knowledge base .so if u opt a general subject u ll have to put lesser labour and u can reap better results.so i suggest you not to go for physics as it will affect your other subjects.(