Fluid Mechanics

41. Cavitation will begin when

  1. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
  2. pressure becomes more than critical pressure
  3. flow is increased
  4. pressure is increased
  5. none of the above.

Correct answer: (A)
the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

42. Center of buoyancy is the

  1. centroid of the displaced volume of fluid
  2. center of pressure of displaced volume
  3. e.g. of floating 'body
  4. does not exist
  5. none of the above.

Correct answer: (A)
centroid of the displaced volume of fluid

43. Center of pressure compared to e.g. is

  1. above it
  2. below it.
  3. at same point
  4. above or below depending on area of body
  5. none of the above.

Correct answer: (B)
below it.

44. Center of pressure on an inclined plane is

  1. at the centroid
  2. above the centroid
  3. below the centroid
  4. at metacentre
  5. at center of pressure.

Correct answer: (C)
below the centroid

45. Choose the correct relationship

  1. specific gravity = gravity x density
  2. dynamicviscosity = kinematicviscosity x density
  3. gravity = specific gravity x density
  4. kinematicviscosity = dynamicviscosity x density
  5. hydrostaticforce = surface tension x gravity.

Correct answer: (B)
dynamicviscosity = kinematicviscosity x density

46. Choose the wrong statement

  1. fluids are capable of flowing
  2. fluids conform to the shape of the containing vessels
  3. when in equilibrium, fluids cannot sustain tangential forces
  4. when in equilibrium, fluids can sustain shear forces
  5. fluids have some degree of comprehensibility and offer little resistance to form.

Correct answer: (D)
when in equilibrium, fluids can sustain shear forces

47. Choose the wrong statement. Alcohol is used in manometer, because

  1. its vapour pressure is low
  2. it provides suitable meniscus for the inclined tube
  3. its density is less
  4. it provides longer length for a given pressure difference
  5. it provides accurate readings.

Correct answer: (A)
its vapour pressure is low

48. Density of water is maximum at

  1. 0°C
  2. 0°K
  3. 4°C
  4. 100°C
  5. 20°C.

Correct answer: (C)
4°C

49. Differential monometer is used to measure

  1. pressure in pipes, channels etc.
  2. atmospheric pressure
  3. very low pressure
  4. difference of pressure between two points
  5. velocity in pipes

Correct answer: (D)
difference of pressure between two points

50. Dimensions of surface tension are

  1. MlL°T2
  2. MlL°Tx
  3. MlL r2
  4. MlL2T2
  5. MlL°t.

Correct answer: (A)
MlL°T2

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