नायलॉन और पॉलिएस्टर जैसे रेशे, जो रासायनिक पदार्थों से बनाए जाते हैं, क्या कहलाते हैं?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?