किसी वस्तु पर किया गया कार्य तब धनात्मक माना जाता है जब निम्नलिखित में से कौन सी स्थिति पूरी होती है?

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?