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MCQs

Total Questions : 1709 | Page 7 of 171 pages
Question 61. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is
  1.    0.25
  2.    0.50
  3.    1.0
  4.    none of the above
 Discuss Question
Answer: Option C. -> 1.0
Question 62. An ideal flow of any fluid must satisfy
  1.    Pascal law
  2.    Newton’s law of viscosity
  3.    boundary layer theory
  4.    continuity equation
 Discuss Question
Answer: Option D. -> continuity equation
Question 63. Gradually varied flow is
  1.    steady uniform
  2.    non-steady non-uniform
  3.    non-steady uniform
  4.    steady non-uniform
 Discuss Question
Answer: Option D. -> steady non-uniform
Question 64. The bulk modulus of elasticity
  1.    has the dimensions of 1/pressure
  2.    increases with pressure
  3.    is large when fluid is more compressible
  4.    is independent of pressure and viscosity
 Discuss Question
Answer: Option B. -> increases with pressure
Question 65. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be
  1.    4 kN/m2
  2.    10 kN/m2
  3.    12 kN/m2
  4.    14 kN/m2
 Discuss Question
Answer: Option D. -> 14 kN/m2
Question 66. Which of the following statements is correct?
  1.    Lower critical Reynolds number is of no practical significance in pipe flow problems.
  2.    Upper critical Reynolds number is significant in pipe flow problems.
  3.    Lower critical Reynolds number has the value 2000 in pipe flow
  4.    Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
 Discuss Question
Answer: Option A. -> Lower critical Reynolds number is of no practical significance in pipe flow problems.
Question 67. Centre 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
 Discuss Question
Answer: Option B. -> below it
Question 68. 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
 Discuss Question
Answer: Option C. -> Archimedes’ principle
Question 69. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than
  1.    frictional force
  2.    viscosity
  3.    surface friction
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 70. If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be
  1.    from reservoir A to reservoirs B and C
  2.    from reservoir B to reservoirs C and A
  3.    from reservoir C to reservoirs A and B
  4.    unpredictable
 Discuss Question
Answer: Option C. -> from reservoir C to reservoirs A and B

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