Free Irrigation and Water Management MCQs with Answers
262 Irrigation and Water Management MCQs from Agriculture, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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262 questions · page 3 of 14
41. A spoil bank is formed when the volume of excavated soil is _________________ of embankment filling?
- A. Less than
- B. Equal to
- C. Excess
- D. Not required
Explanation: A spoil bank is the deposit of surplus excavated earth beside a channel or embankment.
Correct answer: Excess- A. Within
- B. Out of
- C. Above
- D. Below
Explanation: A counter berm increases the effective width and stability of the canal bank, helping keep the saturation or seepage gradient line within…
Correct answer: Within- A. 1:4 to 1:6
- B. 1:3 to 1:5
- C. 1:2 to 1:4
- D. 1:5 to 1:7
Explanation: For loamy canal-bank soils, the saturation gradient is commonly taken within a range of about 1:4 to 1:6.
Correct answer: 1:4 to 1:6- A. 2.0 to 4.0
- B. 1.5 to 4.0
- C. 2.5 to 4.5
- D. 3 to 5
Explanation: For an economical gravity-dam design, the shear-friction factor is generally maintained between 1.5 and 4.0.
Correct answer: 1.5 to 4.0- A. Capillary
- B. Hygroscopic
- C. Gravity
- D. Free
Explanation: Gravity water, also called gravitational water, drains downward through soil under gravity and can raise the groundwater table when…
Correct answer: Gravity- A. Storm water
- B. Surface run-off
- C. Rain water
- D. Dry weather flow
Explanation: Storm water is runoff generated by rainfall from catchments, roads, buildings and uncultivated surfaces.
Correct answer: Storm water- A. Reclamation
- B. Leaching
- C. Recultivation
- D. de-salting
Explanation: Leaching removes soluble salts from the root zone by passing sufficient good-quality water through the soil so that salts move below the…
Correct answer: Leaching- A. 30,000
- B. 35,000
- C. 40,000
- D. 45,000
Explanation: In commonly cited Pakistan irrigation statistics, waterlogging and salinity together render roughly 40,000 hectares unproductive each…
Correct answer: 40,00049. A series of vertical steps in a stream made to avoid soil scouring is called ___________________?
- A. Levees
- B. Embankment
- C. Banks
- D. Cascades
Explanation: Cascades are a sequence of small vertical steps or drops constructed in a channel to reduce water velocity and prevent bed erosion.
Correct answer: Cascades- A. Biology
- B. Hydrology
- C. Hydrography
- D. Histology
Explanation: Hydrology studies the occurrence, movement, depletion and replenishment of water on and below the Earth's surface.
Correct answer: Hydrology- A. Field Capacity
- B. Capillarity
- C. Infiltration capacity
- D. All are correct
Explanation: Infiltration capacity is the maximum rate at which soil can absorb water under specified conditions.
Correct answer: Infiltration capacity- A. Soil-moisture deficiency
- B. Field-moisture deficiency
- C. Equivalent-moisture deficiency
- D. a and b are correct
Explanation: The water needed to raise the existing soil moisture to field capacity is called soil-moisture deficiency or field-moisture deficiency.
Correct answer: a and b are correct- A. Increases
- B. Reduces
- C. remain stagnant
- D. Normal
Explanation: A dry soil initially has a high infiltration rate because its pores can readily absorb water; the rate generally declines as the soil…
Correct answer: Increases- A. Infiltrometer
- B. I.C. curve
- C. Rain simulator
- D. v Hydrometer
Explanation: A rain simulator produces artificial rainfall under controlled conditions to study infiltration, runoff and erosion more realistically…
Correct answer: Rain simulator- A. Water
- B. Snow
- C. Ice particles
- D. Gas
Explanation: Water evaporated from a paddy enters the atmosphere as water vapour, which is water in its gaseous state.
Correct answer: Gas- A. Saturation pressure
- B. Vapour pressure
- C. Partial pressure
- D. Atmospheric pressure
Explanation: When air is saturated, the water vapour exerts its maximum pressure at that temperature, called saturation vapour pressure.
Correct answer: Saturation pressure- A. Humidity
- B. Absolute Humidity
- C. relative humidity
- D. All are correct
Explanation: Absolute humidity is the actual mass of water vapour present per unit volume of air, commonly expressed in grams per cubic metre.
Correct answer: Absolute Humidity- A. 30
- B. 35
- C. 40
- D. 45
Explanation: Cloud droplets are extremely small, commonly around 40 microns in diameter, although their size varies with cloud type and conditions.
Correct answer: 40- A. Total irrigable Area
- B. Gross commended area
- C. Culturable Commended area
- D. Annual Intensity
Explanation: Annual intensity measures how much of the total culturable commanded area receives irrigation during a year, expressed as a percentage.
Correct answer: Annual Intensity- A. Probable flood
- B. Ordinary floods
- C. Low floods
- D. High floods
Explanation: A probable flood is the flood magnitude selected for hydraulic design in relation to the project's service life and safety requirements.
Correct answer: Probable flood