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MCQs

Total Questions : 845 | Page 6 of 85 pages
Question 51. A land is known as waterlogged
  1.    when the permanent wilting point is reached
  2.    when gravity drainage has ceased
  3.    capillary fringe reaches the root zone of plants
  4.    none of the above
 Discuss Question
Answer: Option C. -> capillary fringe reaches the root zone of plants
Question 52. The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is
  1.    8 cm
  2.    10 cm
  3.    12 cm
  4.    14 cm
 Discuss Question
Answer: Option C. -> 12 cm
Question 53. When the reservoir is full, the maximum compressive force in a gravity dam is produced
  1.    at the toe
  2.    at the heel
  3.    within the middle third of base
  4.    at centre of base
 Discuss Question
Answer: Option A. -> at the toe
Question 54. Fundamental momentum equation for a hydraulic jump, is
  1.    D₁² - D₂² = (2q/g) × (V₁ - V₂)
  2.    D₂² - D₁² = (2q/g) × (V - V₂)
  3.    D₁² - D₂² = (2q/g) × (V₂ - V₁)
  4.    D₁² + D₂² = (2q/g) × (V₂ - V₁)
 Discuss Question
Answer: Option B. -> D₂² - D₁² = (2q/g) × (V - V₂)
Question 55. The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
  1.    20 m3/sec
  2.    25 m3/sec
  3.    30 m3/sec
  4.    35 m3/sec
 Discuss Question
Answer: Option B. -> 25 m3/sec
Question 56. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by
  1.    (0.99)10
  2.    1 – (0.99)10
  3.    (0.9)00
  4.    l-(0.9)100
 Discuss Question
Answer: Option B. -> 1 – (0.99)10
Question 57. Solution of Laplacian equation in three dimensions d²φ/dx² + d²φ/dy² + d²φ/dz² = 0 of water in a syphon, is done by
  1.    Analytical method
  2.    Khosla's method
  3.    Method of relaxation
  4.    Unwin's method
 Discuss Question
Answer: Option C. -> Method of relaxation
Question 58. In case of a trapezoidal notch fall
  1.    Top length of the piers should not be less than their thickness
  2.    Splay upstream from the notch section is 45°
  3.    Splay downstream from the notch section is 22½°
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 59. For diversion of flood water of rivers, the type of canal constructed, is
  1.    Ridge canal
  2.    Perennial canal
  3.    Inundation canal
  4.    Canal
 Discuss Question
Answer: Option C. -> Inundation canal
Question 60. The water stored in the reservoir below the minimum pool level is called
  1.    useful storage
  2.    dead storage
  3.    valley storage
  4.    surcharge storage
 Discuss Question
Answer: Option B. -> dead storage

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