Question 41 : The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter is 50 m. The velocity of water flowing through the hole, is
1. 31.2 m/sec
2. 31.1 m/sec
3. 31.3 m/sec
4. 31.4 m/sec.
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Question 42 : Euler's equation for the motion of liquids assumes that
1. velocity of flow is non-uniform over the section
2. flow is unsteady along the stream line.
3. fluid is homogeneous and incompressible
4. fluid is viscous
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Question 43 : In flow, the liquid particles may possess
1. pressure energy
2. potential energy
3. kinetic energy
4. all the above.
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Question 44 : Flow in pipes is laminar if Reynold number is
1. more than 3000
2. between 2100 and 3000
3. less than 2100
4. none of these.
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Question 45 : Total head of a liquid particle in motion is the sum of
1. kinetic head and pressure head
2. potential head and pressure head
3. potential head, kinetic head and pressure head.
4. potential head and kinetic head
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Question 46 : The continuity equation
1. relates the momentum per unit volume between two points on a stream line
2. expresses the relationship between work and energy
3. relates mass rate of flow along a stream line
4. requires that Newton's second law of motion be satisfied at every point in fluid.
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Question 47 : If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30°, the time to reach the highest point is
1. 1.5 s.
2. 0.50 s
3. 0.25 s
4. 1.0 s
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Question 48 : In pipe lines, a surge tank is provided
1. to relieve the pressure due to water hammer
2. to overflow the pipe line when suddenly closed
3. to remove the frictional loss in pipe.
4. to provide additional water head
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Question 49 : If cohesion between the molecules of a fluid is more than adhesion between the fluid and glass, the free level of fluid in a dipped glass tube will be
1. higher than the surface of liquid
2. same as the surface of liquid
3. none of these.
4. lower than the surface of liquid
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Question 50 : Gauge pressure is
1. absolute pressure + atmospheric pressure
2. absolute pressure - atmospheric pressure
3. none of these.
4. atmospheric pressure - absolute pressure
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