A wooden stick 2 m long is floating on the surface of the water. The surface tension of water is 0.07 N/m. By putting soap solution on one side of the stick, the surface tension is reduced to 0.06 N/m. The net force on the stick due to surface tension will be:

1. 0.07 N 2. 0.06 N
3. 0.01 N 4. 0.02 N

Subtopic:  Surface Tension |
 66%
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Surface tension may be defined as 

(1) The work done per unit area in increasing the surface area of a liquid under isothermal condition

(2) The work done per unit area in increasing the surface area of a liquid under adiabatic condition

(3) The work done per unit area in increasing the surface area of a liquid under both isothermal and adiabatic conditions

(4) Free surface energy per unit volume

Subtopic:  Surface Tension |
 61%
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The energy needed to break a drop of radius R into n drops of radii r is given by:

1. 4πT(nr2-R2)

2. 43π(r3n-R2)

3. 4πT(R2-nr2)

4. 4πT(r2n+R2)

Subtopic:  Surface Tension |
 69%
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The potential energy of a molecule on the surface of liquid compared to one inside the liquid is  -
(1) Zero                                             

(2) Smaller

(3) The same                                     

(4) Greater

Subtopic:  Surface Tension |
 63%
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Two droplets merge with each other and forms a large droplet. In this process

(1) Energy is liberated

(2) Energy is absorbed

(3) Neither liberated nor absorbed

(4) Some mass is converted into energy

Subtopic:  Surface Tension |
 77%
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Work done in splitting a drop of water of 1 mm radius into 106 droplets is (Surface tension of water =72×10-3 J/m2)

(1) 9.58×10-5 J                 

(2) 8.95×10-5 J

(3) 5.89×10-5 J                   

(4) 5.98×10-5 J

Subtopic:  Surface Tension |
 71%
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The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T= surface tension of the solution)

1. 4π(D2-d2)T                     

2. 8π(D2-d2)T

3. π(D2-d2)T                       

4. 2π(D2-d2)T

Subtopic:  Surface Tension |
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A spherical drop of oil of radius 1 cm is broken into 1000 droplets of equal radii. If the surface tension of oil is 50 dynes/cm, the work done is 


(1) 18 π ergs                     

(2) 180 π ergs

(3) 1800 π ergs                 

(4) 8000 π ergs

Subtopic:  Surface Tension |
 71%
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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

(1) AT-1                       

(2) AT

(3) A2T                         

(4) A2T2

Subtopic:  Surface Tension |
 84%
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The surface tension of a liquid at its boiling point

(1) Becomes zero

(2) Becomes infinity

(3) is equal to the value at room temperature

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

Subtopic:  Surface Tension |
 73%
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