Well, I guess I am not stupid enough that I just simply apply to any random discipline. My graduation was in biotechnology which can have a different curriculum in different countries. For example, MICaB program is Microbiology and Immunology related PhD and I had 5 such subjects in my semesters in college. I did 2 projects in Micro and Immuno. I also checked the curriculum of these universities. Also, it's not like I have done my graduation in Physics and then I am applying in Chemistry for my higher studies.
Secondly, please don't judge anyone just by seeing the number of rejections. There can be many reasons for that.
Thirdly, you doubt my way of filling applications. Well for your kind information I got my degree converted by WES (Which is a US based organization for degree equivalency) and everything else got sorted thereafter.