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.

Concept Questions :-

Equation of continuity
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The area of cross-section of the wider tube shown in the figure is 800 cm2. If a mass of 12 kg is placed on the massless piston, the difference is heights h in the level of water in the two tubes is :

                                             

1.  10 cm

2.  6 cm

3.  15 cm

4.  2 cm

Concept Questions :-

Properties of fluids
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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

Concept Questions :-

Bernoulli theorem
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Equation of continuity based on :

1.  Conservation of mass

2.  Conservation of energy

3.  Conservation of angular momentum

4.  None of these

Concept Questions :-

Equation of continuity
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Bernoulli's theorem is based on :

1.  conservation of energy

2.  conservation of mass

3.  conservation of momentum

4.  conservation of angular momentum

Concept Questions :-

Bernoulli theorem
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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

 

Concept Questions :-

Surface tension
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The energy needed in breaking of a drop of liquid of radius R into n drops of radius r is given by (T is surface tension and P is atmospheric pressure) :

1.  4πr2n-4πR2T

2.  4/3πr2n-4/3πR3T

3.  4πR2n-4πr2T

4.  8πr2n-8πR2T

Concept Questions :-

Surface tension
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A tank is filled with water up to a height H. A hole is made at a depth h below the free surface of the water in the tank. The water coming out of the orifice strikes at a distance S from the walls of the tank. Then S is given by :

(1) 2gH-h(2) gH-h(3) 2gh(4) 4hH-h

 

Concept Questions :-

Equation of continuity
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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

Concept Questions :-

Equation of continuity
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A small spherical solid ball is dropped in a viscous liquid. Its journey in the liquid is best described in the figure by :

                                             

1.  Curve A

2.  Curve B

3.  Curve C

4.  Curve D

Concept Questions :-

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