Oil & Natural Gas Company (ONGC) Recruitment 2015 .  ONGC invites application   for the post of General Duty Medical Officer on Contract basis . Oil and Natural Gas  Corporation Ltd. (ONGC) is, the leader in Exploration & Production (E&P) activities in India  having 72% contribution to India’s total production of crude oil and 48% of natural gas.  ONGC has established more than…