बिहार के किस जिले में विन्ध्यन समूह की शैलें अधिक पाई जाती हैं ? - In which district of Bihar the rocks of Vindhya group are found more? - Bihar Ke Kis Jile Me Vindhyan Samuh Ki Shailein Adhik Pai Jati Hain ? Bihar Gk in hindi, Geographical Structure Gaya question answers in hindi pdf Baksar questions in hindi, Know About Kaimoor Bihar Gk online test Bihar Gk notes in hindi quiz book Banka