भारत की संप्रभुता, एकता और अखंडता को अक्षुण्ण बनाए रखने तथा उसकी रक्षा करने का संकल्प मुख्य रूप से संविधान के किस भाग में निहित 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?