The surface tension of the soap solution is 25×10-3 Nm-1 . The excess pressure inside a soap bubble of diameter 1 cm is 

(1) 10 Pa

(2) 20 Pa

(3) 5 Pa

(4) None of the above

Subtopic:  Surface Tension |
 67%
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When two soap bubbles of radius r1 and r2 (r2>r1) coalesce, the radius of curvature of the common surface is

(1) r2-r1

(2)  r2-r1r2r1

(3) r2r1r2-r1

(4) r2+r1

Subtopic:  Surface Tension |
 82%
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A long cylindrical glass vessel has a small hole of radius 'r' at its bottom. The depth to which the vessel can be lowered vertically in the deep water bath (surface tension T) without any water entering inside is

(1) 4T/rρg

(2) 3T/rρg

(3) 2T/rρg

(4) T/rρg

Subtopic:  Capillary Rise |
 75%
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The excess of pressure inside a soap bubble than that of the outer pressure is

(1) 2Tr

(2) 4Tr

(3) T2r

(4) Tr

Subtopic:  Surface Tension |
 89%
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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 |
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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%
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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%
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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%
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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%
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