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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- A. 0.3%
- B. 2.75%
- C. 0.75%
- D. None of the above
Explanation: Lakes, reservoirs and rivers contain about 0.3% of the world’s freshwater, while most freshwater is locked in ice or stored as…
Correct answer: 0.3%- A. 16
- B. 17
- C. 18
- D. 19
Explanation: The commonly cited irrigation-infrastructure figures for Pakistan include the three major storage reservoirs of Tarbela, Chashma and…
Correct answer: 19- A. Infiltration
- B. Percolation
- C. Seepage
- D. All of these
Explanation: Seepage is the lateral or horizontal movement of water through the sides and bed of an irrigation channel or canal, causing conveyance…
Correct answer: Seepage- A. 400 mm
- B. 450 mm
- C. 500 mm
- D. 550 mm
Explanation: Sargodha receives roughly 400 to 450 mm of annual rainfall, with about 400 mm commonly given in agricultural references.
Correct answer: 400 mm- A. Water required
- B. Delta of water
- C. Crop water required
- D. None of these
Explanation: Delta is the total depth of irrigation water required by a crop over its complete base period or crop period.
Correct answer: Delta of water6. Surface removal of ice or snow from a glacier or snowfield by melting, sublimation, and/ or calving:
- A. Abrasion
- B. Backplain
- C. Ablation
- D. Bank-Caving
Explanation: Ablation is the loss of glacier or snowfield mass through melting, sublimation, and calving.
Correct answer: Ablation- A. 10,000 liters 104
- B. 100,000 liters or 105
- C. 100,000,00 liters or 107
- D. None of the aboveAgriculture & Forestry
Explanation: One hectare equals 10,000 m², so a 1 mm depth over it gives 10 m³, or 10,000 litres, equal to 10⁴ litres.
Correct answer: 10,000 liters 104- A. All of these
- B. Planning and designing of future canals on proper lines.
- C. Planting of eucalyptus in water-logged areas.
- D. Installation of tube-wells for irrigation and vertical drainage.
Explanation: Tube wells provide vertical drainage, sound canal planning reduces seepage and excess recharge, and deep-rooted trees such as eucalyptus…
Correct answer: All of these- A. both A and B
- B. Methyle alcohol
- C. Cetyle alcohol
- D. None of these
Explanation: Cetyl alcohol, also called hexadecanol, forms a thin film on the water surface that reduces evaporation.
Correct answer: Cetyle alcohol- A. Water distribution
- B. None of the above
- C. both A & B
- D. Water management
Explanation: Water management means the planned development, allocation, distribution and efficient use of water resources.
Correct answer: Water management- A. Direct evaporation from the soil & transpiration from vegetation
- B. down-ward drainage
- C. Surface run-off from the fieldGeology
- D. Hydroponics loss
Explanation: Soil-water losses include evaporation, transpiration, runoff, and drainage below the root zone.
Correct answer: Hydroponics loss- A. Both A & B
- B. 100000 litres of water
- C. 100 tonnes of water
- D. 10 tonnes of water
Explanation: One hectare-centimetre equals 10,000 m² × 0.01 m = 100 m³ of water. Since 1 m³ weighs about 1 tonne, this is 100 tonnes or 100,000 litres.
Correct answer: Both A & B- A. Inversely related
- B. Not related
- C. Directly related
- D. Occasionally related
Explanation: With adequate atmospheric demand, greater available soil moisture generally permits greater evapotranspiration, so the two are treated as…
Correct answer: Directly related- A. 0.7 ppm
- B. 1.5 ppm
- C. 2 ppm
- D. 3 ppm
Explanation: Boron is needed in trace amounts but becomes toxic relatively easily, so irrigation water containing up to about 0.7 ppm is generally…
Correct answer: 0.7 ppm- A. 99 & 1
- B. 90 & 10
- C. 80 & 20
- D. None of the above
Explanation: Domestic sewage is approximately 99% water and 1% dissolved and suspended solids.
Correct answer: 99 & 1- A. Mestrophic
- B. Oligotrophic
- C. Eutrophic
- D. Hydrotrophic
Explanation: Oligotrophic water is clear, nutrient-poor and has low biological productivity, with little organic matter or sediment.
Correct answer: Oligotrophic- A. All the above
- B. CO2
- C. SO3
- D. O2
Explanation: During photosynthesis, algae consume carbon dioxide and release oxygen, while the removal of carbon dioxide raises the water’s pH.
Correct answer: O2- A. Evaptranspiration
- B. Transpiration
- C. Evaporation
- D. Guttation
Explanation: Evapotranspiration combines evaporation from the soil and water surfaces with transpiration from plants.
Correct answer: Evaptranspiration- A. Hydrometer
- B. Lysimeter
- C. Thermometer
- D. Tensiometer
Explanation: A lysimeter measures the water balance of a soil column, including water lost through deep percolation below the root zone.
Correct answer: Lysimeter- A. Canal system
- B. Modified basin system
- C. All the above
- D. Drip irrigation
Explanation: Canal irrigation, modified basin irrigation and drip irrigation can all be used in Pakistan, although drip requires greater initial…
Correct answer: All the aboveIrrigation and Water Management MCQs: common questions
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