प्रकाश रासायनिक धूमकोहरा (Photochemical smog) का निर्माण किसकी उपस्थिति में सबसे तीव्र होता 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?