Fluid Mechanics

161. The ratio of absolute viscosity to mass density is known as

1. specific viscosity
2. viscosity index
3. kinematic viscosity
4. coefficient of viscosity
5. coefficient of compressibility.

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162. The region between the separation streamline and the boundary surface of the solid body is known as

1. wake
2. drag
3. lift
4. boundary layer
5. aerofoil section.

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163. The resultant of all normal pressures acts

1. at e.g. of body
2. at center of pressure
3. vertically upwards
4. at metacentre
5. vertically downwards.

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164. The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to

1. Buoyancy
2. Equilibrium of a floating body
3. Archimedes’ principle
4. Bernoulli’s theorem
5. Metacentric principle.

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165. The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called

1. upthrust
2. reaction
3. buoyancy
4. metacentre
5. center of pressure.

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166. The resultant upward pressure of the fluid on an immersed body is called

1. upthrust
2. buoyancy
3. center of pressure
4. all the above are correct
5. none of above is correct.

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167. The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will

1. increase
2. remain unaffected
3. may increase or decrease depending on the characteristics of liquid
4. decrease
5. unpredictable.

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168. The specific weight of water is 1000 kg/m"

1. at normal pressure of 760 mm
2. at 4°C temperature
3. at mean sea level
4. all the above
5. none of the above.

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169. The speed of sound in a ideal gas varies directly as its

1. pressure
2. temperature
3. density
4. modulus of elasticity
5. absolute temperature,

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170. The stress-strain relation of the newtoneon fluid is

1. linear
2. parabolic
3. hyperbolic
4. inverse type
5. none of the above.

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