Fluid Mechanics

71. Hot wire anemometer is used to measure

1. pressure in gases
2. liquid discharge
3. pressure in liquids
4. gas velocities
5. temperature.

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72. Hydrometer is used to determine

1. specific gravity of liquids
2. specific gravity of solids
3. specific gravity of gases
4. relative humidity
5. density.

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73. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

1. specific weight
2. specific mass
3. specific gravity
4. specific density
5. none of the above.

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74. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

1. higher than the surface of liquid
2. the same as the surface of liquid
3. lower than the surface of liquid
4. unpredictable
5. none of the above.

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75. If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water

1. 51 cm
2. 50 cm
3. 52 cm
4. 52.2 cm
5. 51.7 cm.

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76. If no resistance is encountered by displacement, such a substance is known as

1. fluid
2. water
3. gas
4. perfect solid
5. ideal fluid.

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77. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be

1. 2 meters of water column
2. 3 meters of water column
3. 5 meters of water column
4. 6 meters of water Column
5. 7 meters of water column.

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78. 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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79. 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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80. 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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