Fluid Mechanics

31. 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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32. 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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33. Barometer is used to measure

1. pressure in pipes, channels etc.
2. atmospheric pressure
3. very low pressure
4. difference of pressure between two points
5. rain level.

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34. Bernoulli equation deals with the law of conservation of

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

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35. 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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36. 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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37. Cavitation is caused by

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

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38. Cavitation will begin when

1. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
2. pressure becomes more than critical pressure
3. flow is increased
4. pressure is increased
5. none of the above.

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39. Center of buoyancy is the

1. centroid of the displaced volume of fluid
2. center of pressure of displaced volume
3. e.g. of floating ‘body
4. does not exist
5. none of the above.

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40. Center of pressure compared to e.g. is

1. above it
2. below it.
3. at same point
4. above or below depending on area of body
5. none of the above.

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