Getting a Job in ONGC be it in any domain Geology, Physics or Engineering, is subject to vacancies issued by ONGC through Advertisements. Usually GATE Score is a mandatory requirement for applying for Positions. ONGC Does have vacancies for Physics and Chemistry Graduates/Postgraduates, though they are less in number and highly competitive. Some other PSUs and Research Organizations requiring Physics Postgraduates/Graduates are BARC, DRDO, CSIR as well as ISRO.