Salinity And Water Logging(Engineering > Irrigation Engineering ) Questions and Answers

Question 1. Estimate the leaching requirement when electrical conductivity (EC) value of a saturated extract of soil is 10 m mho/cm at 25% reduction in the yield of the crop. The EC of irrigation water is 1.5 m mho/cm.
  1.    15%
  2.    6.66%
  3.    7.5%
  4.    10%
Explanation:-
Answer: Option C. -> 7.5%
Answer: (c).7.5%
Question 2. The higher the concentration of sodium present in the irrigation water, the lower is the risk.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option B. -> False
Answer: (b).False
Question 3. Which type of soils is benefited by using tile drainage?
  1.    Dry Soils
  2.    Black Soils
  3.    Wet Soils
  4.    Red Soils
Explanation:-
Answer: Option C. -> Wet Soils
Answer: (c).Wet Soils
Question 4. Tile drainage helps to reduce soil erosion.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option A. -> True
Answer: (a).True
Question 5. How can tile drainage help to increase crop yields?
  1.    Increases Free Gravity Water
  2.    Increases Volume of Soil
  3.    Decrease Air Circulation
  4.    Increases Water Table Level
Explanation:-
Answer: Option B. -> Increases Volume of Soil
Answer: (b).Increases Volume of Soil
Question 6. For maximum productivity of crops both surface and sub-surface drains are sometimes needed.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option A. -> True
Answer: (a).True
Question 7. In what chemical ways does tile drainage help in plant growth?
  1.    Decreases Alkalinity of Soils
  2.    Increases salinity of Soils
  3.    Increases Nitrogen
  4.    Reduces and Removes Toxic Substances
Explanation:-
Answer: Option D. -> Reduces and Removes Toxic Substances
Answer: (d).Reduces and Removes Toxic Substances
Question 8. Which type of alternate layouts system for tile drainage has two mains?
  1.    Grid Iron System
  2.    Natural System
  3.    Double main System
  4.    Herring Bone System
Explanation:-
Answer: Option C. -> Double main System
Answer: (c).Double main System
Question 9. What is the size of the tile at an outlet of a 12 hectare drainage system, if the D.C is 2 cm and the tile grade is 0.5%. Assume the rugosity coefficient as 0.015 for the tile drain material.
  1.    10 cm
  2.    20 cm
  3.    15 cm
  4.    25 cm
Explanation:-
Answer: Option B. -> 20 cm
Answer: (b).20 cm
Question 10. How many cubic metres of water will be removed for this particular period of a system designed to use a D.C of 1.5 cm draining 20 hectares for a capacity of 5 days?
  1.    10000 m³
  2.    25000 m³
  3.    15000 m³
  4.    20000 m³
Explanation:-
Answer: Option C. -> 15000 m³
Answer: (c).15000 m³
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