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Viscosity, Stoke's law, terminal velocity, streamline and turbulent flow, critical velocity Mock Test for JEE

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Q1PhysicsUnit 7: Properties of Solids and Liquids
According to Stoke's law, the viscous drag force, on an oil drop is proportional to:
Q2PhysicsUnit 7: Properties of Solids and Liquids
Due to air a falling body faces a resistive force proportional to square of velocity v,v, consequently its effective downward acceleration is reduced and is given by a=g−kv2a=g-k v^{2} where k=k= 0.002m−1.0.002 m^{-1} . The terminal velocity of the falling body is (in⁡m/s)(\operatorname{in} \mathrm{m} / \mathrm{s})
Q3PhysicsUnit 7: Properties of Solids and Liquids
Eight drops of a liquid of density ρ\rho and each radius a are falling through air with a constant velocity 3.75cms−13.75 \mathrm{cm} s^{-1} when the eight drops coalesce to from a single drop the terminal velocity of the new drop will be
Q4PhysicsUnit 7: Properties of Solids and Liquids
Read the following statements and pick the correct choice Statement A: With increase in temperature, viscosity of a gas increases and that of a liquid decreases. Statement B: If the density of a small sphere is equal to the density of the liquid in which it is dropped, then the terminal velocity of the sphere will be zero.

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