विद्युत तापन उपकरणों के तापन तत्वों (heating elements) को बनाने के लिए मुख्य रूप से निम्नलिखित में से किस सामग्री का उपयोग किया जाता है?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?