झारखण्ड में स्थापित सर्वप्रथम आधुनिक उद्योग कौनसा है ? - Which is the first modern industry established in Jharkhand? - Jharkhand Me Sthapit Sarwapratham Aadhunik Udyog Kaunsa Hai ? Jharkhand Gk in hindi, अर्थव्यवस्था इंजीनियरीग Udyog question answers in hindi pdf एल्युमुनियम Udyog questions in hindi, Know About Lauh Ispat Jharkhand Gk online test Jharkhand Gk notes in hindi quiz book Rasayan Udyog