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MCQs

Total Questions : 99 | Page 8 of 10 pages
Question 71. For flow through soils, the characteristic length in Reynolds number is taken as ________
  1.    uniformity coefficient
  2.    coefficient of curvature
  3.    coefficient of percolation
  4.    average diameter of the particles
 Discuss Question
Answer: Option B. -> coefficient of curvature
Answer: (b).coefficient of curvature
Question 72. Darcy’s law in some cases is not valid in ______
  1.    clay
  2.    silt
  3.    fine sand
  4.    coarse-gravel
 Discuss Question
Answer: Option D. -> coarse-gravel
Answer: (d).coarse-gravel
Question 73. The linear dependency between velocity of flow and hydraulic gradient exists if effective size of soil _______
  1.    does not exceed 3mm
  2.    exceeds 3mm
  3.    equal to 3mm
  4.    equal to 5mm
 Discuss Question
Answer: Option A. -> does not exceed 3mm
Answer: (a).does not exceed 3mm
Question 74. The critical Reynolds number varies from ________ for validity of Darcy’s law.
  1.    0.1-75
  2.    75-100
  3.    100-175
  4.    175-200
 Discuss Question
Answer: Option A. -> 0.1-75
Answer: (a).0.1-75
Question 75. The drainage property of silty clay is ________
  1.    very good
  2.    good
  3.    fair
  4.    very poor
 Discuss Question
Answer: Option D. -> very poor
Answer: (d).very poor
Question 76. The velocity of flow of water at the centre of tube is _______ when the head is 0.1m, η=8.9*10¯³ dynes-s/cm², γw=1 g/cm³, the length is 10m and the diameter is 20cm.
  1.    20 cm/s
  2.    22 cm/s
  3.    28 cm/s
  4.    30 cm/s
 Discuss Question
Answer: Option C. -> 28 cm/s
Answer: (c).28 cm/s
Question 77. For flow of water in tube, the velocity at surface is ___________
  1.    zero
  2.    equal to velocity at 1/3 of diameter
  3.    equal to velocity at 1/2 of diameter
  4.    equal to velocity at centre
 Discuss Question
Answer: Option A. -> zero
Answer: (a).zero
Question 78. In Poiseuille’s law of flow, the variation of the velocity is given by _______
  1.    v = \(\frac{hγ_w}{4ηL}(r^2-R^2)\)
  2.    v = \(\frac{hγ_w}{14ηL}(R^2-r^2)\)
  3.    v = \(\frac{hγ_w}{4ηL}(R^2-r^2)\)
  4.    v = \(\frac{hγ_w}{8ηL}(R^2-r^2)\)
 Discuss Question
Answer: Option C. -> v = \(\frac{hγ_w}{4ηL}(R^2-r^2)\)
Answer: (c).v = \(\frac{hγ_w}{4ηL}(R^2-r^2)\)
Question 79. The quantity of water flowing in thin cylindrical sheet of thickness dr is ____________
  1.    \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)2πrdr\)
  2.    \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)4πrdr\)
  3.    \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)8πrdr\)
  4.    \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)12πrdr\)
 Discuss Question
Answer: Option A. -> \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)2πrdr\)
Answer: (a).\(dq=\frac{hγ_w}{4ηL}(R^2-r^2)2πrdr\)
Question 80. In falling head permeability test apparatus, the water head at any time instant is equal to ____________
  1.    Difference in the water level
  2.    Cross-sectional area of pipe
  3.    Height of permeameter
  4.    None of the mentioned
 Discuss Question
Answer: Option B. -> Cross-sectional area of pipe
Answer: (b).Cross-sectional area of pipe

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