बिहार प्रांत का विधिवत उद्घाटन जिसकी राजधानी पटना बनी, कब हुआ था ? - When was the Bihar province, whose capital Patna was formally inaugurated? - Bihar Praant Ka Vidhivat Inaugration Jiski Rajdhani Patana Bani , Kab Hua Tha ? Bihar Gk in hindi, Bihar Modern History Quiz 1 April , 1901 question answers in hindi pdf 1 January , 1912 questions in hindi, Know About 1 April , 1912 Bihar Gk online test Bihar Gk notes in hindi quiz book Inme Se Koi Nahi