EASY
Earn 100

What is the SI unit of surface energy in C.G.S. system?

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Important Questions on Mechanical Properties of Fluids

MEDIUM
A water drop of diameter 2 cm is broken into 64 equal droplets. The surface tension of water is 0.075 N m-1. In this process the gain in surface energy will be
MEDIUM
A drop of radius R breaks into n equal drops. What is the ratio of total final surface energy to initial surface energy?
EASY
Two droplets coalesce in a single drop. In this process _______.
MEDIUM
Surface tension of a soap bubble is 2.0×10-2 N m-1 . Work done to increase the radius of soap bubble from 3.5 cm to 7 cm will be : [Take π=227 ]
MEDIUM
Work done in increasing the size of a soap bubble from radius of (3 to 5) cm is nearly (surface tension of soap solution =0.03 N m-1)
MEDIUM

If 1000 droplets of water of surface tension 0.07 N m-1. having same radius 1 mm each, combine to from a single drop. In the process the released surface energy is-

Take π=227

EASY
Water does not wet an oily glass because
EASY
The surface tension of the soap water solution is 110πN m-1. The free energy of the surface layer of a soap bubble of diameter 5 mm will be
MEDIUM
Two small drops of mercury each of radius R coalesce to form a large single drop. The ratio of the total surface energies before and after the change is
MEDIUM
Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly (surface tension of soap solution =0.05Nm-1)
MEDIUM
A mercury drop of radius 103 m is broken into 125 equal size droplets. Surface tension of mercury is 0.45 N m1 . The gain in surface energy is:
HARD
A large number of liquid drops each of radius r coalesce to form a single drop of the radius R. The energy released in the process is converted into kinetic energy of the big drop so formed. The speed of the big drop is (given surface tension of the liquid T, density ρ)
EASY
The amount of energy required to form a soap bubble of radius 2 cm from a soap solution is nearly: (surface tension of soap solution = 0.03 N m-1)
MEDIUM
A spherical drop of liquid splits into 1000 identical spherical drops. If ui is the surface energy of the original drop and uf is the total surface energy of the resulting drops, the (ignoring evaporation), ufui=10x. Then value of x is ______:
EASY
A soap bubble of radius r is blown up to form a bubble of radius 2r under isothermal conditions. If σ is the surface tension of the soap solution, the energy spent in the process is
MEDIUM
When two soap bubbles of radii a and b(b>a) coalesce, the radius of curvature of common surface is:
EASY
A soap bubble of radius R is blown. After heating the solution, a second bubble of radius 2R is blown. The work required to blow the second bubble in comparison to that required for the first bubble is
MEDIUM
Two small drops of mercury each of radius R coalesce to form a single large drop. The ratio of total surface energy before and after the change is
MEDIUM
A liquid does not wet the solid surface if angle of contact is:
MEDIUM
A big water drop is formed by the combination of n small water drops of equal radii. The ratio of the surface energy of n drops to the surface energy of the big drop is