A spherical liquid drop of radius R is divided into eight equal droplets. If surface tension is T, then the work done in this process will be

(a) 2πR2T                        (b) 3πR2T

(c) 4πR2T                         (d) 2πRT2

Concept Questions :-

Surface tension
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The radius of a soap bubble is increased from 1πcm to 2π cm. If the surface tension of water is 30 dynes per cm, then the work done will be

(a) 180 ergs                          (b) 360 ergs

(c) 720 ergs                          (d) 960 ergs

Concept Questions :-

Surface tension
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If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is 

(a) W/2                    (b) 2W

(c) 4W                     (d) 213W

 

Concept Questions :-

Surface tension
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If the surface tension of a liquid is T, the gain in surface energy for an increase in liquid surface by A is

(a) AT-1                       (b) AT

(c) A2T                         (d) A2T2

Concept Questions :-

Surface tension
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The surface tension of a soap solution is 2×10-2 N/m. To blow a bubble of radius 1 cm, the work done is

(a) 4π×10-6 J                        (b) 8π×10-6 J

(c) 12π×10-6 J                       (d) 16π×10-6 J

Concept Questions :-

Surface tension
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The surface tension of a liquid at its boiling point

(a) Becomes zero

(b) Becomes infinity

(c) is equal to the value at room temperature

(d) is half to the value at the room temperature

Concept Questions :-

Surface tension
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The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 m2, its surface energy is

(a) 5×10-2 joule                         (b) 2×10-2 joule

(c) 4×10-4 joule                         (d) 0.8×10-1 joule

Concept Questions :-

Surface tension
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What is ratio of surface energy of 1 small drop and 1 large drop, if 1000 small drops combined to form 1 large drop ?

(a) 100 : 1                           (b) 1000 : 1
(c) 10 : 1                             (d) 1 : 100

Concept Questions :-

Surface tension
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The amount of work done in forming a soap film of size is 10 cm X 10 cm(Surface tension T=3×10-2 N/m)

(a) 6×10-4 J                 (b) 3×10-4 J

(c) 6×10-3 J                  (d) 3×10-3 J

Concept Questions :-

Surface tension
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A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is σ, then change in surface energy is 

(a) πD2σ                          (b) 2πD2σ

(c) 3πD2σ                         (d) 4πD2σ

Concept Questions :-

Surface tension
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