If the dry density, water density, and specific gravity of solids of a given soil sample are 1.6 g/cc, 1.00 g/cc, and 2.56 respectively, the porosity of the soil sample is:

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?