शोध में आंतरिक वैधता (internal validity) का कारक मुख्य रूप से किसे स्थापित करने के मुद्दे से संबंधित है?

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?