Fluid Mechanics

171. The surface tension of mercury at normal temperature compared to that of water is

1. more
2. less
3. same
4. more or less depending on size of glass tube
5. none of the above.

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172. The tendency of a liquid surface to contract is due to the following property

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

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173. The time oscillation of a floating body with increase in metacentric height will be

1. same
2. higher
3. lower
4. lower/higher depending on weight of body
5. unpredictable.

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174. The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream

1. keeps on increasing
2. keeps on decreasing
3. remains constant
4. may increase/decrease
5. unpredictable.

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175. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

1. the area is horizontal
2. the area is vertical
3. the area is inclined
4. all of the above
5. none of the above.

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176. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be

1. 500 kg
2. 1000 kg
3. 1500 kg
4. 2000 kg
5. 4000 kg.

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177. The two important forces for a floating body are

1. buoyancy, gravity
2. buoyancy, pressure
3. buoyancy, inertial
4. inertial, gravity
5. gravity, pressure.

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178. The units of dynamic or absolute viscosity are

1. metres2 per sec
2. kg sec/meter
3. newton-sec per meter
4. newton-sec2 per meter
5. none of the above.

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179. The units of kinematic viscosity are

1. metres2 per sec
2. kg sec/metre
3. newton-sec per metre
4. newton-sec per metre
5. none of the above.

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180. The units of viscosity are

1. metres2 per sec
2. kg sec/metre
3. newton-sec per metre2
4. newton-sec per meter
5. none of the above.

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