ठोस अवस्था में विद्युत धारा प्रवाहित करने वाला अधात्विक पदार्थ कौन सा 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?