बिहार की सर्वाधिक पुरानी जलविद्युत परियोजना निम्नलिखित में से कौनसी है ? - - Which of the following is the oldest hydroelectric project of Bihar? , - Bihar Ki Sarwaadhik Purani Jalvidhyut Pariyojana NimnLikhit Me Se Kaunsi Hai ? - Bihar Gk in hindi, Canals and Irrigation Poorvi Mandal Nahar Pariyojana , Valmiki Nagar question answers in hindi pdf Pashchimi Son Nahar , Pariyojana Dehri questions in hindi, Know About kataiya Jalvidyut Pariyojana Bihar Gk online test Bihar Gk notes in hindi quiz book Poorvi Son Link Nahar Pariyojana , barun