The pressure of air in a soap bubble of 0.7cm diameter is 8 mm of water above the pressure outside. The surface tension of the soap solution is

(1) 100 dyne/cm

(2) 68.66 dyne/cm

(3) 137 dyne/cm

(4) 150 dyne/cm

Subtopic:  Surface Tension |
 69%
From NCERT
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The pressure inside two soap bubbles are 1.01 and 1.02 atmospheres. The ratio between their volumes is

(1) 102 : 101

(2) (102)3:(101)3

(3) 8 : 1

(4) 2 : 1

Subtopic:  Surface Tension |
From NCERT
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The radii of two soap bubbles are r1 and r2 . In isothermal conditions, two meet together in a vacuum. Then the radius of the resultant bubble is given by

(1) R=(r1+r2)/2

(2) R=r1(r1r2+r2)

(3) R2=r12+r22 

(4) R=r1+r2

Subtopic:  Surface Tension |
 75%
From NCERT
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When a large bubble rises from the bottom of a lake to the surface, its radius doubles. If atmospheric pressure is equal to that of a column of water height H, then the depth of the lake is

(1) H

(2) 2H

(3) 7H

(4) 8H

Subtopic:  Pressure |
 62%
From NCERT
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The excess pressure of one soap bubble is four times more than the other. Then the ratio of the volume of the first bubble to another one is 

(1) 1 : 64

(2) 1 : 4

(3) 64 : 1

(4) 1 : 2

Subtopic:  Surface Tension |
 69%
From NCERT
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There are two liquid drops of different radii. The excess pressure inside over the outside is 

(1) More in the big drop

(2) More in the small drop

(3) Equal in both drops

(4) There is no excess pressure inside the drops

Subtopic:  Surface Tension |
 84%
From NCERT
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If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

(1) 10m

(2) 20m

(3) 60m

(4) 30m

Subtopic:  Pressure |
 71%
From NCERT
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In capillary tube, pressure below the curved surface of water will be 

(1) Equal to atmospheric

(2) Equal to upper side pressure

(3) More than upper side pressure

(4) Lesser than upper side pressure

Subtopic:  Capillary Rise |
 52%
From NCERT
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Two soap bubbles have different radii but their surface tension is the same. Mark the correct statement

(1) Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble

(2) Pressure of the larger bubble is higher than the smaller bubble

(3) Both bubbles have the same internal pressure

(4) None of the above

Subtopic:  Surface Tension |
 84%
From NCERT
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Due to capillary action, a liquid will rise in a tube, if the angle of contact is 

(1) Acute

(2) Obtuse

(3) 90°

(4) Zero

Subtopic:  Capillary Rise |
 74%
From NCERT
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