जीन पियाजे के संज्ञानात्मक विकास के चरणों के अनुसार, पूर्व-संक्रियात्मक अवस्था (pre-operational stage) के बच्चों की मुख्य विशेषता क्या होती है?

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?