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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Two parallel glass plates are dipped partly in the liquid of density 'd' keeping them vertical. If the distance between the plates is 'x', surface tension for liquids is T and angle of contact is θ, then rise of liquid between the plates due to capillary will be 

(a) T cosθxd                   (b) 2T cosθxdg

(c) 2T xdgcosθ                (d) T cosθxdg

Concept Questions :-

Capillary rise
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Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75×10-4 N force due to the weight of the liquid. If the surface tension of water is 6×10-2 Nm-1, the inner circumference of the capillary must be

(a) 1.25×10-2 m                    (b) 0.50×10-2 m

(c) 6.5×10-2 m                      (d) 12.5×10-2 m

Concept Questions :-

Capillary rise
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Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

(a) 2 : 3                           (b) 3 : 2
(c) 3 : 4                           (d) 4 : 3

Concept Questions :-

Capillary rise
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A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is
(S.T. of water =75 dyne/cm, g =1000 cm/s2)

(a) 100 cm                          (b) 75 cm
(c) 50 cm                            (d) 30 cm

Concept Questions :-

Capillary rise
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Water rise in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75×10-3 N/m, then the diameter of capillary will be

(a) 0.1 mm                          (b) 0.5 mm
(c) 1.0 mm                          (d) 2.0 mm

Concept Questions :-

Capillary rise
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A capillary tube made of glass is dipped into mercury. Then

1. Mercury rises in the capillary tube

2. Mercury rises and flows out of the capillary tube

3. Mercury descends in the capillary tube

4. Mercury neither rises nor descends in the capillary tube

Concept Questions :-

Capillary rise
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By inserting a capillary tube upto a depth l in water, the water rises to a height h ( h<l). If the lower end of the capillary is closed inside water and the capillary is taken out and closed end opened, to what height the water will remain in the tube ?

(a) Zero                              (b) l+h 
(c) 2h                                 (d) h

Concept Questions :-

Capillary rise
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If the surface tension of water is 0.06 Nm-1, then the capillary rise in a tube of diameter 1 mm is ( θ=0° )

(a) 1.22 cm                                (b) 2.44 cm
(c) 3.12 cm                                (d) 3.86 cm

Concept Questions :-

Capillary rise
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