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Multiple Choice Question.
Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is
Concept: Fluid and Its Properties
The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly ______.
Concept: Surface Tension
Why is the surface tension of paints and lubricating oils kept low?
Concept: Surface Tension
How much amount of work is done in forming a soap bubble of radius r?
Concept: Surface Tension
Why is a low-density liquid used as a manometric liquid in a physics laboratory?
Concept: Fluid and Its Properties
With what terminal velocity will an air bubble 0.4 mm in diameter rise in a liquid of viscosity 0.1 Ns/m2 and specific gravity 0.9? Density of air is 1.29 kg/m3.
Concept: Critical Velocity and Reynolds Number
A rectangular wireframe of size 2 cm x 2 cm, is dipped in a soap solution and taken out. A soap film is formed, if the size of the film is changed to 3 cm x 3 cm, Calculate the work done in the process. The surface tension of the soap film is 3 x 10-2 N/m.
Concept: Fluid and Its Properties
Insect moves over the surface of water because of ______.
Concept: Surface Tension
The surface tension of a liquid at critical temperature is ______
Concept: Surface Tension
What is the surface film?
Concept: Fluid and Its Properties
What is the net weight of a body when it falls with terminal velocity through a viscous medium?
Concept: Critical Velocity and Reynolds Number
A square metal plate of area 100 cm2 moves parallel to another plate with a velocity of 10 cm/s, both plates immersed in water. If the viscous force is 200 dyne and the viscosity of water is 0.01 poise, what is the distance between them?
Concept: Critical Velocity and Reynolds Number
The relative velocity between two parallel layers of water is 8 cm/s and the perpendicular distance between them is 0.1 cm. Calculate the velocity gradient.
Concept: Critical Velocity and Reynolds Number
State properties of an ideal fluid.
Concept: Fluid and Its Properties
Compare streamline flow and Turbulent flow.
Concept: Fluids in Motion
A raindrop of radius 0.3 mm falls through the air with a terminal velocity of 1 m/s. The viscosity of air is 18 x 10−6 Ns /m2. Find the viscous force on the raindrop.
Concept: Critical Velocity and Reynolds Number
Explain the phenomena of surface tension on the basis of molecular theory.
Concept: Surface Tension
Obtain an expression for the capillary rise or fall using the forces method.
Concept: Surface Tension
State Stoke’s law and give two factors affecting angle of contact.
Concept: Stokes’ Law
A liquid rises in glass capillary tube upto a height of 2.5 cm at room temperature. If another glass capillary tube having radius half that of the earlier tube is immersed in the same Liquid, the rise of liquid in it will be _______.
Concept: Capillarity and Capillary Action
