The excess of pressure inside a soap bubble than that of the outer pressure is

(a) 2Tr                       (b) 4Tr

(c) T2r                         (d) Tr

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Surface tension
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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

(a) 100 dyne/cm                              (b) 68.66 dyne/cm
(c) 137 dyne/cm                              (d) 150 dyne/cm

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Surface tension
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Pressure inside two soap bubbles are 1.01 and 1.02 atmospheres. Ratio between their volumes is

(a) 102 : 101                             (b) (102)3:(101)3
(c) 8 : 1                                     (d) 2 : 1

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Surface tension
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The radii of two soap bubbles are r1 and r2 . In isothermal conditions, two meet together in vaccum. Then the radius of the resultant bubble is given by

(a) R=(r1+r2)/2                    (b) R=r1(r1r2+r2)

(c) R2=r12+r22                         (d) R=r1+r2

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Surface tension
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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 column of water height H, then the depth of lake is

(a) H                                  (b) 2H
(c) 7H                                (d) 8H

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Excess pressure of one soap bubble is four times more than the other. Then the ratio of volume of first bubble to another one is 
(a) 1 : 64                    (b) 1 : 4
(c) 64 : 1                    (d) 1 : 2

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Surface tension
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There are two liquid drops of different radii. The excess pressure inside over the outside is 

(a) More in the big drop

(b) More in the small drop

(c) Equal in both drops

(d) There is no excess pressure inside the drops

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Surface tension
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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

(a) 10m                 (b) 20m
(c) 60m                 (d) 30m

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If the radius of a soap bubble is four times that of another, then the ratio of their pressures will be 

(a) 1 : 4                                 (b) 4 : 1
(c) 16 : 1                               (d) 1 : 16

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Surface tension
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A spherical drop of water has radius 1 mm If surface tension of water is 70×10-3 N/m difference of pressures between inside and out side of the spherical drop is

(a)35 N/m2                            (b) 70 N/m2
(c)140 N/m2                           (d) Zero

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Surface tension
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