When two small bubbles join to form a bigger one, energy is

(a) Released                           (b) Absorbed
(c) Both (a) and (b)                (d) None of these

Concept Questions :-

Surface tension
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A film of water is formed between two straight parallel wires of length 10cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water =7.2×10-2 N/m)

(a) 7.22×10-6 Joule                         (b) 1.44×10-5 Joule

(c) 2.88×10-5 Joule                          (d) 5.76×10-5 Joule

Concept Questions :-

Surface tension
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A drop of mercury of radius 2 mm is split into 8 identical droplets. Find the increase in surface energy. (Surface tension of mercury is 0.465 J/m2
(a)23.4 μJ                              (b) 18.5 μJ
(c) 26.8 μJ                              (d) 16.8 μJ

Concept Questions :-

Surface tension
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Two small drops of mercury, each of radius r, coalesce to form a single large drop. The ratio of the total surface energies before and after the change is

1. 1:21/3                          2. 21/3 :1

3. 2:1                              4. 1:2

Concept Questions :-

Surface tension
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The work done in blowing a soap bubble of radius 0.2 m is (the surface tension of soap solution being 0.06 N/m)

(a) 192 π×10-4J                 (b) 280 π×10-4J

(c) 200 π×10-4J                 (d) None of these

Concept Questions :-

Surface tension
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A liquid film is formed in a loop of area 0.05 m2. Increase in its potential energy will be (T = 0.2 N/m)

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

(c) 3×10-2 J               (d) None of these

Concept Questions :-

Surface tension
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In order to float a ring of area 0.04 m2 in a liquid of surface tension 75 N/m, the required surface energy will be

(a) 3 J                   (b) 6.5 J
(c) 1.5 J                 (d) 4 J

Concept Questions :-

Surface tension
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If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be

(a) r                                  (b) 0
(c) Infinity                         (d) 1/2r

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Surface tension
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When the temperature is increased the angle of contact of a liquid 

(a) Increases

(b) Decreases

(c) Remains the same

(d) First increases and then decreases

Concept Questions :-

Surface tension
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The angle of contact between glass and mercury is

(a) 0°                                     (b) 30°
(c) 90°                                   (d) 135°

Concept Questions :-

Surface tension
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