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

Subtopic:  Surface Tension |
 67%
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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 

(1) 1000 : 1               

(2) 1 : 1000

(3) 10 : 1                   

(4) 1 : 10

Subtopic:  Surface Tension |
 54%
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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

(1) R/2                                     

(2) R/5

(3) R/6                                     

(4) R/10

Subtopic:  Surface Tension |
 90%
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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 
(1) 1 : 10                     

(2) 1 : 15

(3) 1 : 20                     

(4) 1 : 25

Subtopic:  Surface Tension |
 84%
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When two small bubbles join to form a bigger one, energy is

(1) Released

(2) Absorbed

(3) Both (1) and (2)

(4) None of these

Subtopic:  Surface Tension |
 81%
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A water film is formed between the two straight parallel wires, each of length \(10~\text{cm}\), kept at a separation of \(0.5~\text{cm}.\)Now, the separation between them is increased by \(1~\text{mm}\) without breaking the water film. The work done for this is
(surface tension of water =\(7.2\times 10^{-2}~\text{N/m}\))
1. \(7.22\times 10^{-6}~\text{J}\)
2. \(1.44\times 10^{-5}~\text{J}\)
3. \(2.88\times 10^{-5}~\text{J}\)
4. \(5.76\times 10^{-5}~\text{J}\)

Subtopic:  Surface Tension |
 62%
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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

(1)23.4 μJ

(2) 18.5 μJ

(3) 26.8 μJ

(4) 16.8 μJ

Subtopic:  Surface Tension |
 64%
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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

(1) r                                 

(2) 0

(3) Infinity                         

(4) 1/2r

Subtopic:  Surface Tension |
 61%
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The angle of contact between glass and mercury is

(1) 0°

(2) 30°

(3) 90°

(4) 135°

Subtopic:  Surface Tension |
 76%
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A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

(1) Acute

(2) Obtuse

(3) Zero

(4) 90°

Subtopic:  Surface Tension |
 86%
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