Fluid Mechanics

161. 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.

Correct answer: (C)
cohesion

162. 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.

Correct answer: (D)
viscosity

163. 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.

Correct answer: (C)
kinematic viscosity

164. 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.

Correct answer: (A)
wake

165. 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.

Correct answer: (C)
vertically upwards

166. 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.

Correct answer: (C)
Archimedes' principle

167. 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.

Correct answer: (C)
buoyancy

168. 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.

Correct answer: (B)
buoyancy

169. 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.

Correct answer: (D)
decrease

170. 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.

Correct answer: (D)
all the above

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