An incompressible liquid travels as shown in the figure. The speed of the fluid in the lower branch will :

1. 1 m/s

2. 1.5 m/s

3. 2.25 m/s

4. 3 m/s

Subtopic:  Equation of Continuity |
 78%
From NCERT
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Two spherical soap bubbles of radii r1 and r2 in vaccum collapse under isothermal condition. The resulting bubble has radius equal to :

1.  r1 + r22 

2.  r1r2r1 - r2  

3.  r1r1 

4.  r12 + r22

 

Subtopic:  Surface Tension |
 65%
From NCERT
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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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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 |
 56%
From NCERT
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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%
From NCERT
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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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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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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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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%
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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 |
 52%
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