बिहार राज्य के बरौनी में स्थित तेल शोधक कारखाना किसकी इकाई है ? - Whose unit is the oil refinery located at Barauni in the state of Bihar? - Bihar Rajya Ke Barauni Me Sthit Tel Shodhak Karkhana Kiski Ikai Hai ? Bihar Gk in hindi, Udyog Hindustan Petroleum question answers in hindi pdf Bhaarat Petroleum questions in hindi, Know About O.N.Ji.Si Bihar Gk online test Bihar Gk notes in hindi quiz book Indian Tel Nigam