Fluid Mechanics

31. An ideal flow of any fluid must fulfill the following

1. Newton's law of motion
2. Newton's law of viscosity
3. Pascal' law
4. Continuity equation
5. Boundary layer theory.

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32. An ideal flow of any fluid must satisfy

1. Pascal law
2. Newton's law of viscosity
3. boundary layer theory
4. continuity equation
5. Bernoulli's theorem.

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33. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of 'g' at this place is

1. 10m/sec2
2. 9.81 m/sec2
3. 10.2/m sec
4. 9.75 m/sec2
5. 9 m/sec .

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34. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

1. 1
2. 1.2
3. 0.8
4. 0.75
5. 1.25.

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35. An open vessel of water is accelerated up an inclined plane. The free water surface will

1. be horizontal
2. make an angle in direction of inclination of inclined plane
3. make an angle in opposite direction to inclination of inclined plane
4. any one of above is possible
5. none of the above.

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36. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

1. minimum
2. maximum
3. zero
4. negative value
5. could be any value.

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37. Bernoulli equation deals with the law of conservation of

1. mass
2. momentum
3. energy
4. work
5. force.

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38. Buoyant force is

1. the resultant force acting on a floating body
2. the resultant force on a body due to the fluid surrounding it
3. equal to the volume of liquid dis-placed
4. the force necessary to maintain equilibrium of a submerged body
5. none of the above.

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39. Capillary action is due to the

1. surface tension
2. cohesion of the liquid
3. adhesion of the liquid molecules and the molecules on the surface of a solid
4. all of the above
5. none of the above.

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40. Cavitation is caused by

1. high velocity
2. high pressure
3. weak material
4. low pressure
5. low viscosity.

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