Darcy's friction factor for a fully developed flow through a closed duct is given by which of the following expressions? (Where Dh is hydraulic diameter, τw is wall shear stress, Δp* is piezometric pressure drop over a length L, ρ is density and V is average flow velocity.)

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?

Which of the following viceroys of India is associated with the 'Ilbert Bill' controversy?