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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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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The liquid meniscus in the capillary tube will be convex if the angle of contact is

(1) Greater than 90°

(2) Less than 90°

(3) Equal to 90°

(4) Equal to 0°

Subtopic:  Capillary Rise |
 80%
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The value of contact angle for kerosene with a solid surface.

(1) 0°

(2) 90°

(3) 45°

(4) 33° 

Subtopic:  Surface Tension |
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