पृथ्वी के भूमध्य रेखा से लगभग कितनी ऊंचाई पर भू-स्थिर (जियोस्टेशनरी) संचार उपग्रह स्थित होते हैं?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?