बिहार के दक्षिण के मैदान में कौनसी मिट्टी पायी जाती है ? - Which soil is found in the southern plain of Bihar? - Bihar Ke Dakshinn Ke Maidan Me Kaunsi Mitti Payi Jati Hai ? Bihar Gk in hindi, Land and Soil Karail - Kaival question answers in hindi pdf Khadar questions in hindi, Know About Daldali Bihar Gk online test Bihar Gk notes in hindi quiz book balsundari