Doctor of Philosophy, also known as PhD is a research-oriented program. Many Universities all over the globe offer the course in various disciplines. Postgraduates in any streams can pursue the PhD course in the related fields so as to carry out research and development in the concerned areas. The PhD entrance exams conducted may vary with Universities. Only Masters’ degree holders’ will be eligible to appear for the test. Most of the Universities require 55% marks in the qualifying course. The percentage requisites may vary with institutes.