असहयोग आन्दोलन के दौरान प्रिंस ऑफ वेल्स की पटना यात्रा कब हुई ? - When did the Prince of Wales visit Patna during the non-cooperation movement? - Asahyog Andolan Ke Dauran Prins Of Vales Ki Patana Yatra Kab Hui ? Bihar Gk in hindi, Bihar Modern History Quiz 22 - 23 December , 1921 question answers in hindi pdf 19 - 20 December , 1920 questions in hindi, Know About 19 - 20 December , 1921 Bihar Gk online test Bihar Gk notes in hindi quiz book 22 - 23 December , 1920