एक विक्षुब्ध प्रवाह (turbulent flow) में अपरूपण प्रतिबल (shear stress) मुख्य रूप से किसके कारण होता 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?