प्रारंभिक वैदिक काल के दौरान, 'वर्ण' व्यवस्था मुख्य रूप से किस पर आधारित थी?

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?