A tube of length L is filled completely with an incompressible liquid of mass M and closed at both ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by liquid at the other end is (B) MLm2 2 (C) MoL 4 2

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The radius of a soap bubble is increased from R to 2 R. Work done in this process (T = surface tension) is

1.  24 πR2T

2.  48 πR2T

3.  12 πR2T

4.  36 πR2T

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When a cylinderical tube is dipped vertically into a liquid the angle of contact in 140°. When the tube is dipped with an inclination of 40° the angle of contact is 

1.  100°    

2.  140°  

3.  180°  

4.    60°

 

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Two liquid drops have their diameters as 1 mm and 2 mm. The ratio of excess pressure in them is 

1.  1:2

2.  2:1

3.  4:1

4.  1:4

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