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A big drop of radius R is formed from 1000 droplets of water. The radius of a droplet will be _______
A) 10 R
B) R/10
C) R/100
D) R/1000
Concept: Surface Tension
State any two characteristics of the angle of contact
Concept: Surface Tension
Calculate the work done in increasing the radius of a soap bubble in air from 1 cm to 2 cm. The surface tension of soap solution is 30 dyne/cm. (Π = 3.142).
Concept: Surface Tension
What is the decrease in weight of a body of mass 500 kg when it is taken into a mine of depth 1000 km? (Radius of earth R = 6400 km, g = 9.8 m/s2)
Concept: Variation in the Acceleration>Variation in Gravity with Altitude
When a sparingly soluble substance like alcohol is dissolved in water, surface tension of water
Concept: Surface Tension
Define binding energy and obtain an expression for binding energy of a satellite revolving in a circular orbit round the earth.
Concept: Binding Energy and Escape Velocity of a Satellite
Obtain an expression for the rise of a liquid in a capillary tube.
Concept: Capillarity and Capillary Action
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
