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

1.  2L2

2.  MLω2

3.  2L4

4.  ML2ω22

Concept Questions :-

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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

Concept Questions :-

Surface tension
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When a body of mass 'm', destiny dB is suspended from a wire, its elongation is 'e' when the body is in-air. If the body is completely immersed in non-viscous liquid of density d then its elongation is

1. e1-dldB

2. e1-dBdl

3. edBdl-1

4. edBdl

Concept Questions :-

Archimedes principle
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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

Concept Questions :-

Bernoulli theorem
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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

Concept Questions :-

Types of flow
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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

Concept Questions :-

Equation of continuity
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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

Concept Questions :-

Surface tension
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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°

 

Concept Questions :-

Surface tension
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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

Concept Questions :-

Surface tension
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If a soap bubble of radius 3 cm coalesce with another soap bubble of radius 4 cm under isothermal conditions, the radius of the resultant bubble formed is in cm-

1. 7

2. 1

3. 5

4. 12

Concept Questions :-

Surface tension
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