रासायनिक ऊर्जा को विद्युत ऊर्जा में परिवर्तित करने वाले उपकरण को ______ कहा जाता 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?