Nature of meniscus for liquid of 00 angle of contact

(a) Plane                               (b) Parabolic
(c) Semi-spherical                  (d) Cylindrical

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Surface tension
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A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is 
(a) Flat                                 (b) Concave
(c) Convex                            (d) Cylindrical

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Surface tension
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For which of the two pairs, the angle of contact is same

(a) Water and glass; glass and mercury

(b) Pure water and glass; glass and alcohol

(c) Silver and water; mercury and glass

(d) Silver and chromium; water and chromium

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Surface tension
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If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is 
(a) Acute angle                (b) Obtuse angle
(c) 90°                            (d) 0°

Concept Questions :-

Surface tension
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If two soap bubbles of different radii are in communication with each other

(a) Air flows from larger bubble into the smaller one

(b) The size of the bubbles remains the same

(c) Air flows from the smaller bubble into the large one and the larger bubble grows at the expense of the smaller one

(d) The air flows from the larger

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

(a) 10 Pa                      (b) 20 Pa

(c) 5 Pa                        (d) None of the above

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Surface tension
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When two soap bubbles of radius r1 and r2 (r2>r1) coalesce, the radius of curvature of common surface is

(a) r2-r1                       (b)  r2-r1r2r1

(c) r2r1r2-r1                          (d) r2+r1

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Surface tension
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The excess pressure due to surface tension in a spherical liquid drop of radius r is directly proportional to

(a) r                                 (b) r2

(c) r-1                               (d) r-2

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Surface tension
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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

(a) 4T/rρg                   (b) 3T/rρg

(c) 2T/rρg                   (d) T/rρg

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Capillary rise
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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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