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

Concept Questions :-

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

Concept Questions :-

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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

Concept Questions :-

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

Concept Questions :-

Surface tension
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In capillary tube, pressure below the curved surface of water will be 

(a) Equal to atmospheric

(b) Equal to upper side pressure

(c) More than upper side pressure

(d) Lesser than upper side pressure

Concept Questions :-

Capillary rise
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The pressure inside a small air bubble of radius 0.1 mm situated just below the surface of water will be equal to
[Take surface tension of water 70×10-3 Nm-1 and atmospheric pressure =1.013×105 Nm-2 ]

(a) 2.054×103 Pa            (b) 1.027×103 Pa

(c) 1.027×105 Pa            (d) 2.054×105 Pa

Concept Questions :-

Surface tension
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Two bubbles A and B are joined through a narrow tube where bubble A is bigger. Then 

1. The size of A will increase

2. The size of B will increase

3. The size of B will increase until the pressure equals

4. None of these

Concept Questions :-

Surface tension
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Two soap bubbles have different radii but their surface tension is the same. Mark the correct statement

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

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

(c) Both bubbles have the same internal pressure

(d) None of the above

Concept Questions :-

Surface tension
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If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm, then the surface tension of soap solution will be (r = 1 cm and density d = 0.8 gm/cc)

(a) 3.9 N/m                 

(b) 3.9×10-2 N/m

(c) 3.9×10-3 N/m       

(d) 3.9 dyne/m

Concept Questions :-

Surface tension
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Due to capillary action, a liquid will rise in a tube, if the angle of contact is 

(a) Acute                   (b) Obtuse
(c) 90°                      (d) Zero

Concept Questions :-

Capillary rise
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