You have completed the syllabus of the SSC JE and Other AE & JE exam for Hydrology & Irrigation. Now BYJU'S Exam Prep brings you the 100 most important questions of the Hydrology & Irrigation.
Here you will find the 100 most important questions for the Hydrology & Irrigation subject of the Civil Engineering Engineering syllabus. The top 10 questions are attached here rest questions you can find in the below pdf.
1. Method of applying water directly to the root zone of the plant is called
A. Check flooding B. Furrow irrigation
C. Drip irrigation D. Sprinkler irrigation
Sol. Drip irrigation is the latest method of irrigation. In this method water and fertilizer is
supplied slowly and directly to the rootzone of the plants in order to minimize the losses
due to evaporation and percolation.
Different methods of irrigation
* free flooding
* Border flooding
* Check flooding
* Basin flooding
* Furrow method
* Sprinkler method
2. Soil becomes, practically infertile if its pH value is
A. 1 B. 4
C. 11 D. 14
Sol. Soil becomes, practically infertile if its pH value is 11
3. Check flooding method of irrigation can be used for
A. Less permeable soils.
B. More permeable soils.
C. Both more permeable and less permeable soils.
D. Rolling lands only.
Sol. Check flooding is suitable for both more permeable and less permeable soils. Deep
homogenous loam or clay soils with medium infiltration rates are more preferred for this
4. A sprinkler irrigation system is suitable when
A. the land gradient is steep and the soil is easily erodible
B. the soil is having low permeability
C. the water table is low
D. the crops to be grown have deep roots
Sol. On steep gradients frequent flow irrigation can not be provided, here sprinkler irrigation
5. The intensity of irrigation means
A. percentage of culturable command area to be irrigated annually
B. percentage of gross command area to be irrigated annually
C. percentage of the mean of culturable command area and the gross commanded area to
be irrigated annually
D. total depth of water supplied by the number of waterings
Sol. Intensity of irrigation is defined as the percentage of the irrigation proposed to be irrigated
annually. Usually the areas irrigated during each crop season (Rabi, Kharif, etc) is
expressed as a percentage of the CCA which represents the intensity of irrigation for the
6. The method of irrigation adopted at places where there exists acute scarcity of irrigation
A. Sprinkler irrigation method B. furrow irrigation method
C. drip irrigation method D. basin flooding
Sol. In drip irrigation method water is slowly and directly applied to the root zone of plants
thereby minimizing the losses by evaporation and percolation.
7. The method of growing crops on rides, running on the sides of water ditches, is known as
A. Flood irrigation B. Furrow irrigation
C. Check irrigation D. None of them
Sol. Flood irrigation is the method in which soil is submerged and thoroughly flooded with water,
so as to cause through saturation of the land.
Furrow irrigation is a type of surface irrigation in which trenches or “furrows” are dug
between crop rows in a field.
8. In an irrigation project, in a certain year, 60% and 46% of the cultivable command area in
Kharif and Rabi respectively, remained without water and rest of the area got irrigation
water. The intensity of irrigation in that year for the project was
A. 126% B. 80%
C. 124% D. 94%
Sol. Intensity of irrigation = Area under Rabi crop + Area under Kharif crop
= (100 – 60) + (100 – 46)
= 40 + 54 = 94%
9. When an oven dried sample of soil is kept open in the atmosphere, it absorbs some amount of water. This water is known as
A.Capillary water B. Gravity water
C.Hygroscopic water D. Available water
Sol. When an oven dried sample of soil is kept open in the atmosphere, it absorbs some amount of water. This water is known as hygroscopic water. Hygroscopic water cannot be extracted or absorbed by the root plants. So, at this stage, growth of plants is stopped and ultimately the plants are dead.
10. The moisture content of the soil, after free drainage has removed most of the gravity water is known as
A. Permanent wilting point B.Available moisture
C.Field capacity D. Saturation capacity
Sol. The moisture content of the soil, after free drainage has removed most of the gravity water is known as Field capacity. Field capacity of soil depends upon capillary tension in soil and porosity of soil.
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