Under which major nationalist movement did the British colonial government launch 'Operation Quit India' (often colloquially referred to as Operation Zero Hour) to arrest top Congress leaders?

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?