निम्नलिखित में से कौन सा खनिज अपने उत्कृष्ट विद्युतरोधी (insulating) गुणों और उच्च वोल्टेज के प्रति प्रतिरोधक क्षमता के लिए जाना जाता है, जो इसे विद्युत उद्योगों में अनिवार्य बनाता 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?