निम्नलिखित में से कौन सा सेमीकंडक्टर डिवाइस अपने सामान्य ऑपरेटिंग क्षेत्र में ऋणात्मक प्रतिरोध विशेषताओं (negative resistance characteristics) को प्रदर्शित नहीं करता 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?