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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One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to the total initial surface energy is 

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

Concept Questions :-

Surface tension
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If σ be the surface tension, the work done in breaking a big drop of radius R in n drops of equal radius is 

(a) Rn2/3σ                          (b) (n2/3-1)

(c) (n1/3-1)                    (d) 4πR2(n1/3-1)σ

Concept Questions :-

Surface tension
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A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is

(a) R/2                                     (b) R/5
(c) R/6                                     (d) R/10

Concept Questions :-

Surface tension
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8000 identical water drops are combined to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is 
(a) 1 : 10                     (b) 1 : 15
(c) 1 : 20                      (d) 1 : 25

Concept Questions :-

Surface tension
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If work done in increasing the size of a soap film from 10 cm ×6 cm to 10 cm×11 cm is 2×10-4 J then the surface tension is

(a) 2×10-2 Nm-1              (b) 2×10-4 Nm-1

(c) 2×10-6 Nm-1              (d) 2×10-8 Nm-1

Concept Questions :-

Surface tension
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A mercury drop of radius 1cm is sprayed into 106 drops of equal size. The energy expended in joules is (surface tension of Mercury is 460×10-3 N/m)

(a) 0.057                      (b) 5.7

(c) 5.7×10-4                (d) 5.7×10-6

Concept Questions :-

Surface tension
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