If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be

(a) r                                  (b) 0
(c) Infinity                         (d) 1/2r

Concept Questions :-

Surface tension
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When the temperature is increased the angle of contact of a liquid 

(a) Increases

(b) Decreases

(c) Remains the same

(d) First increases and then decreases

Concept Questions :-

Surface tension
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The angle of contact between glass and mercury is

(a) 0°                                     (b) 30°
(c) 90°                                   (d) 135°

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Surface tension
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A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

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

Concept Questions :-

Surface tension
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The liquid meniscus in the capillary tube will be convex if the angle of contact is

(a) Greater than 90°                                 (b) Less than 90°
(c) Equal to 90°                                  (d) Equal to 0°

Concept Questions :-

Capillary rise
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The value of contact angle for kerosene with solid surface.
(a) 0°                                     (b) 90°
(c) 45°                                   (d) 33° 

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Surface tension
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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

Concept Questions :-

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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