ब्रिटिश भारत में पहली बार पूर्ण रूप से जाति आधारित जनगणना किस वर्ष आयोजित की गई थी?

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?