बिहार के कितने जिलों में केयर्न एनर्जी सर्च लि.द्वारा पेट्रोलियम एवं प्राकृतिक गैस का अन्वेषण प्रारम्भ हुआ है ? - In how many districts of Bihar has Cairn Energy Search Ltd. started exploration of petroleum and natural gas? - Bihar Ke Kitne Zilon Me Cairn Energy Search Li.Dwara Petroleum Aivam Prakritik Gas Ka Anveshann Prarambh Hua Hai ? Bihar Gk in hindi, Government Schemes 7 question answers in hindi pdf 13 questions in hindi, Know About 4 Bihar Gk online test Bihar Gk notes in hindi quiz book 11