बिहार के किस क्षेत्र में आहर या पाइन द्वारा सिंचाई की जाती है ? - Which area of Bihar is irrigated by Ahar or Pine? - Bihar Ke Kis Shetra Me Aahar Ya Pine Dwara Irrigation Ki Jati Hai ? Bihar Gk in hindi, River and Lakes Munger question answers in hindi pdf Shahabad questions in hindi, Know About Patana Bihar Gk online test Bihar Gk notes in hindi quiz book Ye Sabhi