किसी शुद्ध अर्धचालक में डोपिंग (अपमिश्रण) करने से मुख्य रूप से निम्नलिखित में से किस राशि में वृद्धि 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?