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Test: Irrigation Techniques & Water Requirement of Crops - 1 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test GATE Civil Engineering (CE) 2025 Mock Test Series - Test: Irrigation Techniques & Water Requirement of Crops - 1

Test: Irrigation Techniques & Water Requirement of Crops - 1 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2025 Mock Test Series preparation. The Test: Irrigation Techniques & Water Requirement of Crops - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Irrigation Techniques & Water Requirement of Crops - 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Irrigation Techniques & Water Requirement of Crops - 1 below.
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Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 1

With the increase in supplied irrigation water, the yield of crops

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 1

Initially, when supply increases plants will get adequate water depth for their growth but ager certain limit water will cause water logging thus, degrading the growth of plants.

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 2

The duty of irrigation water for a given crop is maximum

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 2

Concept:
Duty: 

  • It is the number of hectares of land irrigated for full growth of a given crop by a supply of 1 cumec of water continuously during the entire base period of that crop.
  • Duty is the area that can be irrigated by the discharge of 1 cumec of water.
  • At the head of the canal, there are numerous losses to occur later which requires more amount of water to irrigate a particular field. However, if considered on the field, all losses have already occurred and a lesser amount of water is required to irrigate the same considered area.
  • Duty of water changes from place to place, it will be maximum at the field and minimum at the head of the canal.

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 3

Consumptive use of water for a crop represents

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 3

Crop consumptive water use is the amount of water transpired during plant growth plus what evaporates from the soil surface and foliage in the crop area. In short, evapotranspiration needs of cropped area plus the minor quantity required in plant metabolism. 

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 4

Permanent wilting point moisture content for a crop represents the

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 4

Permanent wilting point is the point beyond which the roots of plant cannot access water. It is the hygroscopic water. 
Useful soil moisture for plant growth is capillary water.

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 5

The method of irrigation adopted at places where there exists acute scarcity of irrigation water is:

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 5

Drip irrigation method

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 6

The efficiency of water conveyance does not depend upon

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 6

The efficiency of water conveyance primarily depends on factors such as the geometry of the conveyance system, the nature of the boundary of the conveyance system, and the method of application of water. These factors directly influence the flow characteristics, friction losses, and overall effectiveness of water delivery.

Climatic conditions, while they can affect evaporation rates and other environmental factors, do not directly impact the efficiency of the conveyance system itself.

Therefore, the efficiency of water conveyance does not depend upon: Climatic conditions

 

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 7

Consider the following details of crops as given below:

If the latitude of the place is 30C, then consumptive use of crop
[Use Blaney-Criddle equation and crop factor, k=0.75]

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 7

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 8

Commonly adopted moisture tension, in atmosphere, of a soil at permanent wilting point is

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 8

 

The soil moisture tension at the permanent wilting point is usually around 15 atmospheres or -15 bars. This is the point at which plants can no longer extract enough water to meet their needs and remain wilted until water is added to the soil. 

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 9

At field capacity, water is held in most of the soils at a tension of

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 9

Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 10

Irrigation frequency is a function of

Detailed Solution for Test: Irrigation Techniques & Water Requirement of Crops - 1 - Question 10
Factors affecting irrigation frequency:

  • Soil: Different soil types have different water holding capacities. Sandy soils require more frequent irrigation compared to clay soils.

  • Crop: Different crops have different water requirements. Some crops may need frequent irrigation while others can survive with less water.

  • Climate: The climate of a region plays a crucial role in determining irrigation frequency. Regions with high temperatures and low humidity may require more frequent irrigation.


Importance of soil, crop, and climate in determining irrigation frequency:

  • Soil type determines the water holding capacity and drainage capabilities, which directly impact irrigation frequency.

  • Crop water requirements vary based on factors like growth stage, root depth, and transpiration rates, influencing the frequency of irrigation.

  • Climate conditions such as temperature, humidity, and wind speed affect evapotranspiration rates, which in turn determine irrigation needs.


Conclusion:

Considering the interplay of soil, crop, and climate factors is essential in determining the most suitable irrigation frequency for optimal crop growth and water use efficiency.

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