Fluid Mechanics

151. The normal stress in a fluid will be constant in all directions at a point only if

1. it is incompressible
2. it has uniform viscosity
3. it has zero viscosity
4. it is frictionless
5. it is at rest.

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152. The normal stress is same in all directions at a point in a fluid

1. only when the fluid is frictionless
2. only when the fluid is incompressible and has zero viscosity
3. when there is no motion of one fluid layer relative to an adjacent layer
4. irrespective of the motion of one fluid layer relative to an adjacent layer
5. in case of an ideal fluid.

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153. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

1. meta center
2. center of pressure
3. center of buoyancy
4. center of gravity
5. none of the above.

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154. The pressure at a point in a fluid will not be same in all the directions when the fluid is

1. moving
2. viscous
3. viscous and static
4. inviscous and moving
5. viscous and moving.

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155. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

1. 1 Pa
2. 91 Pa
3. 981 Pa
4. 9810 Pa
5. 98,100 Pa.

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156. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be

1. 2 metres of water column
2. 3 metres of water column
3. 3.5 metres of water column
4. 4 m of water column
5. none of the above.

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157. The process of diffusion of one liquid into the other through a semi-permeable membrane is called

1. viscosity
2. osmosis
3. surface tension
4. cohesion
5. diffusivity.

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158. The property by virtue of which a liquid opposes relative motion between its different layers is called

1. surface tension
2. co-efficient of viscosity
3. viscosity
4. osmosis
5. cohesion.

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159. The property of a fluid which enables it to resist tensile stress is known as

1. compressibility
2. surface tension
3. cohesion
4. adhesion
5. viscosity.

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160. The property of fluid by virtue of which it offers resistance to shear is called

1. surface tension
2. adhesion
3. cohesion
4. viscosity
5. all of the above.

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