गण्डक नदी बिहार के किस स्थान पर गंगा में मिलती है ? - Where does the Gandak river join the Ganges in Bihar? - Gandak Nadi Bihar Ke Kis Sthan Par Ganga Me Milti Hai ? Bihar Gk in hindi, Drainage System Patana Ke Nikat question answers in hindi pdf Aara Ke Nikat questions in hindi, Know About Chhapra Ke Nikat Bihar Gk online test Bihar Gk notes in hindi quiz book Inme Se Koi Nahi