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Class XI Physics Mechanics of Fluids 5

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Question 1

A large drop of oil, whose density is less than that of water, floats up through a column of water. Assume that the oil and the water do not mix. The coefficient of viscosity of the oil is ηo and that of water is ηw. The velocity of the drop will depend on

Question 2

The rate of flow of liquid through a capillary tube in an experiment to determine the viscosity of liquid, increases -

Question 3

The terminal velocity of a spherical ball of radius r falling through a viscous liquid is proportional to -

Question 4

A raindrop reaching the ground with terminal velocity has momentum ρ. Another drop of twice the radius, also reaching the ground with terminal velocity, will have momentum–

Question 5

A 20 cm long capillary tube is clipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be

Question 6

A ball is made of a material of density ρ where ρoil < ρ < ρwater with ρoil and ρwater representing the densities of oil and water, respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, which of the following pictures represents its equilibrium position ?

Question 7

A drop of water and a soap bubble have the same radii. Surface tension of soap solution is half of that of water. The ratio of excess pressure inside the drop and bubble is -

Question 8

Consider a liquid contained in a glass container. The adhesive force is very weak as compared to the cohesive force in the liquid. The shape of the liquid surface near the glass surface shall be–
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