Construction of submarines is based on 
(1) Archimedes’ principle               

(2) Bernoulli’s theorem

(3) Pascal’s law                             

(4) Newton’s laws

Subtopic:  Archimedes' Principle |
 74%
From NCERT
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In which one of the following cases will the liquid flow in a pipe be most streamlined  ?

(1) Liquid of high viscosity and high density flowing through a pipe of small radius

(2) Liquid of high viscosity and low density flowing through a pipe of small radius

(3) Liquid of low viscosity and low density flowing through a pipe of large radius

(4) Liquid of low viscosity and high density flowing through a pipe of large radius

Subtopic:  Types of Flows |
 57%
From NCERT
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Two water pipes of diameters 2 cm and 4 cm are connected with the main supply line. The velocity of flow of water in the pipe of 2 cm diameter is -

(1) 4 times that in the other pipe

(2) 3 times that in the other pipe

(3) 2 times that in the other pipe

(4) 6 times that in the other pipe

Subtopic:  Equation of Continuity |
 79%
From NCERT
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An incompressible liquid flows through a horizontal tube as shown in the following fig. Then the velocity v of the fluid is

(1)    3.0 m/s                          

(2) 1.5 m/s                     

 

(3) 1.0 m/s                             

(4) 2.25 m/s

 

Subtopic:  Equation of Continuity |
 81%
From NCERT
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The velocity of kerosene oil in a horizontal pipe is 5 m/s. If g=10m/s2, then the velocity head of oil will be:
1. 1.25 m
2. 12.5 m
3. 0.125 m                             
4. 125 m

Subtopic:  Bernoulli's Theorem |
 75%
From NCERT
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In the following fig. is shown the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the

 

(a) Height of the liquid in the tube A is maximum

(b) Height of the liquid in the tubes A and B is the same

(c) Height of the liquid in all the three tubes is the same

(d) Height of the liquid in the tubes A and C is the same

 

Subtopic:  Bernoulli's Theorem |
 75%
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A manometer connected to a closed tap reads 3.5×105 N/m2. When the valve is opened, the reading of manometer falls to 3.0×105 N/m2 , then velocity of flow of water is
(1) 100 m/s                                       

(2) 10 m/s

(3) 1 m/s                                           

(4) 1010 m/s

Subtopic:  Bernoulli's Theorem |
 71%
From NCERT
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A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is
(1) 10                                       

(2) 20

(3) 25.5                                     

(4) 5

Subtopic:  Bernoulli's Theorem |
 91%
From NCERT
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There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm=105 N/m2) then the velocity of water flowing from hole is 

(a) 400  m/s             (b) 600  m/s

(c) 60  m/s                (d) None of these

 

Subtopic:  Bernoulli's Theorem |
 55%
From NCERT
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A cylindrical tank has a hole of 1 cm2 in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of 70 cm3/sec. then the maximum height up to which water can rise in the tank is
(1) 2.5 cm                                             

(2) 5 cm

(3) 10 cm                                               

(4) 0.25 cm

Subtopic:  Bernoulli's Theorem |
 62%
From NCERT
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