व्यापक रूप से, सिंचाई की पद्धतियों को मुख्य रूप से कितनी श्रेणियों में वर्गीकृत किया गया है (सतही सिंचाई और उप-सतही सिंचाई)?

Which movement aimed to promote Khadi, a hand-spun and handwoven cloth native to India?

Who were prominent leaders associated with the initial phase of the Telangana Rebellion (1946-1951) against the Nizam's rule and feudal landlords?

What was the immediate trigger for the Revolt of 1857?