Fluid Mechanics

81. If the surface of liquid is convex, men

1. cohesion pressure is negligible
2. cohesion pressure is decreased
3. cohesion pressure is increased
4. there is no cohesion pressure
5. none of the above.

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82. If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

1. h
2. wh
3. w/h
4. h/w
5. h/wh.

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83. In a forced vortex, the velocity of flow everywhere within the fluid is

1. maximum
2. minimum
3. zero
4. non-zero finite
5. unpredictable.

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84. In a free vortex motion, the radial component of velocity everywhere is

1. maximum
2. minimum
3. zero
4. non-zero and finite
5. unpredictable.

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85. In a static fluid

1. resistance to shear stress is small
2. fluid pressure is zero
3. linear deformation is small
4. only normal stresses can exist
5. viscosity is nil.

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86. In an immersed body, centre of pressure is

1. at the centre of gravity
2. above the centre of gravity
3. below be centre of gravity
4. could be above or below e.g. depend¬ing on density of body and liquid
5. unpredictable.

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87. In an isothermal atmosphere, the pressure

1. decreases linearly with elevation
2. remains constant
3. varies in the same way as the density
4. increases exponentially with elevation
5. unpredictable.

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88. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

1. frictional force
2. viscosity
3. surface friction
4. all of the above
5. none of the above.

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89. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to

1. sin 9
2. sin 9
3. cas 9
4. cos 9
5. tan 9.

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90. In the case of steady flow of a fluid, the acceleration of any fluid particle is

1. constant
2. variable
3. zero
4. zero under limiting conditions
5. never zero.

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