भारतीय संविधान में विद्युत मंडल की स्थापना कब की गई ? - When was the Electricity Board established in the Indian Constitution? - Indian Samvidhan Me Vidyut Mandal Ki Sthapanaa Kab Ki Gayi ? Rajasthan GK in hindi, Energy Resources 12 July 1957 question answers in hindi pdf 19 July 1957 questions in hindi, Know About 21002 Rajasthan GK online test Rajasthan GK notes in hindi quiz book 21 July 1957