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
Subtopic:  Surface Tension |
 61%
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A cubical vessel of height 1 m is full of water. Find the work done in pumping out whole water.

1. 49 J

2. 490 J

3. 4900 J

4. 49000 J

Subtopic:  Bernoulli's Theorem |
 59%
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The flow rate from a tap of diameter 1.25 cm is 3 lit/min. The coefficient of viscosity of water is 10-3 Pas. The nature of flow is :

1. Turbulent

2. Laminar

3. Neither laminar nor turbulent

4. data inadequate

Subtopic:  Types of Flows |
 53%
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Water flowing from a hose pipe fills a 15-liter container in one minute. The speed of water from the free opening of radius 1 cm is (in ms-1) :

1. 2.5

2. π2.5

3. 2.5π

4. 5 π

Subtopic:  Equation of Continuity |
 74%
From NCERT
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Work of 6.0 x 10-4 Joule is required to be done in increasing the size of a soap film from 10cm x 6cm to 10cm x 11cm. The surface tension of the film is :

1. 5 x 10-2 N/m

2. 6 x 10-2 N/m

3. 1.5 x 10-2 N/m

4. 1.2 x 10-1 N/m

Subtopic:  Surface Tension |
 62%
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When a cylindrical tube is dipped vertically into a liquid the angle of contact is 140o. When the tube is dipped with an inclination of 40o, the angle of contact is- 

 

1.  100°    

2.  140°  

3.  180°  

4.    60°

 

Subtopic:  Surface Tension |
 66%
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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

Subtopic:  Surface Tension |
 80%
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The rate of flowing of water from the orifice in a wall of a tank will be more if the orifice is:

1.  Near the bottom

2.  Near the upper end

3.  Exactly in the middle

4.  Does not depend upon the position of the orifice

Subtopic:  Bernoulli's Theorem |
 57%
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Water flows through a frictionless duct with a cross-section varying as shown in the figure. Pressure p at points along the axis is represented by
                      

1. 2.

3.  4.

Subtopic:  Equation of Continuity |
 55%
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In the figure below is shown the flow of liquid through a horizontal pipe. Three tubes A, B, and C are connected to the pipe. The radius of the pipe at A, B, and C is respectively 2 cm, 1 cm, and 2 cm. It can be said that the :



1.  Height of the liquid in the tube A is maximum

2.  Height of the liquid in the tubes A and B is the same

3.  Height of the liquid in all the three tubes is the same

4.  Height of the liquid in the tubes A and C is the same

Subtopic:  Bernoulli's Theorem |
 67%
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