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MCQs

Total Questions : 83 | Page 2 of 9 pages
Question 11. What is Pack Aquifer Ratio?
  1.    D₅₀ of the gravel / D₅₀ of the aquifer
  2.    D₅₀ of the aquifer / D₅₀ of the gravel
  3.    D₆₀ of the aquifer material / D₁₀ of the aquifer material
  4.    D₆₀ of the gravel / D₁₀ of the aquifer
 Discuss Question
Answer: Option A. -> D₅₀ of the gravel / D₅₀ of the aquifer
Answer: (a).D₅₀ of the gravel / D₅₀ of the aquifer
Question 12. A tube well is suitable when the subsoil formation is made up of _____________________
  1.    cracked and faulted rock
  2.    alluvium
  3.    alluvium and various layers of sandy soil, clayey soil, and gravel
  4.    clayey soil
 Discuss Question
Answer: Option C. -> alluvium and various layers of sandy soil, clayey soil, and gravel
Answer: (c).alluvium and various layers of sandy soil, clayey soil, and gravel
Question 13. According to the Central Board of Irrigation and Power, the PA ratio for graded aquifer should be _______________
  1.    9 – 12.5
  2.    12 – 15.5
  3.    > 15.5
  4.    < 9
 Discuss Question
Answer: Option B. -> 12 – 15.5
Answer: (b).12 – 15.5
Question 14. The efficiency of the centrifugal pumps commonly used for lifting water from wells may be of the order of _____________
  1.    30%
  2.    65%
  3.    90%
  4.    95%
 Discuss Question
Answer: Option B. -> 65%
Answer: (b).65%
Question 15. For good design, the uniformity coefficient (Cᵤ) of the gravel material should preferably be ______
  1.    > 2.0
  2.    < 2.0
  3.    > 2.5
  4.    < 2.5
 Discuss Question
Answer: Option D. -> < 2.5
Answer: (d).< 2.5
Question 16. Duty of wells expressed in hectares the well can irrigate to bring a crop to maturity because of ___________
  1.    well irrigation is a minor scheme
  2.    well water is lifted immediately and cannot be expressed in ha/m³/sec
  3.    well is situated in the middle of the commanded area
  4.    wells are owned by cultivators and so the source of supply is a private one
 Discuss Question
Answer: Option B. -> well water is lifted immediately and cannot be expressed in ha/m³/sec
Answer: (b).well water is lifted immediately and cannot be expressed in ha/m³/sec
Question 17. The appropriate life of a tubewell in India is of the order of ______
  1.    1 year
  2.    2 years
  3.    5 years
  4.    15 years
 Discuss Question
Answer: Option D. -> 15 years
Answer: (d).15 years
Question 18. Which of the following strainer is used for shallow irrigation tube wells particularly in deltaic regions of developing countries?
  1.    Continuous slot type of strainer
  2.    Louver type of strainer
  3.    Pipe strainer with fine mesh jackets
  4.    Coir rope strainers
 Discuss Question
Answer: Option D. -> Coir rope strainers
Answer: (d).Coir rope strainers
Question 19. Which of the following is an effective method for the development of well?
  1.    Surging
  2.    Pumping
  3.    Well development by compressed air
  4.    Jetting
 Discuss Question
Answer: Option D. -> Jetting
Answer: (d).Jetting
Question 20. Rewhiding the well involves ____________________
  1.    heavy pumping of well
  2.    starting and stopping of pumping intermittently
  3.    forcing of the well water back into the aquifer
  4.    jetting with water at high velocity
 Discuss Question
Answer: Option B. -> starting and stopping of pumping intermittently
Answer: (b).starting and stopping of pumping intermittently

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