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 9 of 14
- A. Wave wash
- B. Tide
- C. Wave amplitude
- D. Fetch
Explanation: Fetch is the unobstructed distance over which wind blows across a water surface and generates waves.
Correct answer: Fetch- A. Frictional pile
- B. Load Bearing
- C. Cost-in situ piles
- D. All are correct
Explanation: A friction pile transfers its load mainly through skin resistance along the pile-soil interface when it does not reach firm rock or…
Correct answer: Frictional pile- A. Check line
- B. Contour line
- C. Ordinate line
- D. All are correct
Explanation: A contour line joins points having the same elevation or level, and in hydraulic applications similar lines can represent equal hydraulic…
Correct answer: Contour line- A. Evapo-transpiration
- B. Consumptive use
- C. Un-confined water
- D. a & b are correct
Explanation: Evapotranspiration combines evaporation from the soil or nearby field surface with transpiration from plants.
Correct answer: a & b are correct- A. Broad irrigation
- B. Border irrigation
- C. Trickle irrigation
- D. Check irrigation
Explanation: Broad irrigation disposes of sewage by spreading it over specially prepared, level farm land, where it infiltrates the soil and supports…
Correct answer: Broad irrigation- A. 100 cm
- B. 80 cm
- C. 50 cm
- D. 40 cm
Explanation: Cotton is commonly assigned a delta of about 50 cm, representing its total seasonal water requirement expressed as an equivalent depth.
Correct answer: 50 cm- A. Aquifuge
- B. Aquifer
- C. Aquiclude
- D. Confined-aquifer
Explanation: An aquifuge is completely impermeable and cannot store or transmit groundwater.
Correct answer: Aquifuge- A. Laminar flow
- B. Turbulent flow
- C. Irrotational flow
- D. Stream line flow
Explanation: Flood flows have high velocity and strong mixing, producing irregular motion and eddies characteristic of turbulent flow.
Correct answer: Turbulent flow169. The precipitation that falls during the growing season of the crop is called__________________?
- A. all are correct
- B. Direct rain fall
- C. Monsoon rain fall
- D. Useful rain fall
Explanation: Rainfall received during the crop-growing period is termed useful rainfall in this classification because it can contribute directly to…
Correct answer: Useful rain fall- A. Steady
- B. Uniform
- C. Unsteady
- D. Non-Uniform
Explanation: A flow is steady when its properties at a fixed point, such as velocity, pressure or discharge, do not change with time.
Correct answer: Steady- A. Useful storage + surcharge storage -valley storage
- B. Useful storage + surcharge storage
- C. Useful storage + surcharge storage
- D. Useful storage - valley storage
Explanation: For flood-control storage, effective storage is obtained by adding useful and surcharge storage and excluding the valley storage already…
Correct answer: Useful storage + surcharge storage -valley storage- A. Average discharge
- B. Dominant discharge
- C. Maximum discharge
- D. Critical discharge
Explanation: A river's meanders are shaped by the discharge that occurs most frequently and controls long-term channel form, called the dominant or…
Correct answer: Dominant discharge- A. All the above
- B. Crushing
- C. Sliding
- D. Piping
Explanation: Permeable foundations allow seepage beneath a dam or barrage, which can carry soil particles downstream and form internal channels, a…
Correct answer: Piping- A. Desalinization
- B. Water application
- C. Water mixing
- D. All are correct
Explanation: Desalinization, more commonly spelled desalination, removes dissolved salts from saline water; reverse osmosis is one of its principal…
Correct answer: Desalinization- A. Mixing of water
- B. Amalgamation
- C. Desalinization
- D. All are correct
Explanation: Combining saline water with fresh water in a specified proportion is commonly described as amalgamation or blending, with the aim of…
Correct answer: Amalgamation- A. Normal depth
- B. Full supply depth
- C. Critical depth
- D. None of these
Explanation: At critical depth, the specific energy of an open-channel flow is minimum for a given discharge.
Correct answer: Critical depth- A. Half of its width
- B. Equal to its width
- C. Twice the width
- D. one-third of its with
Explanation: For the most economical rectangular channel, the width is twice the depth, so the depth is half the width.
Correct answer: Half of its width178. According to Chezy's formula, the discharge through an open channel is equal to _________________?
- A. C (mi) 1/2
- B. A (cmi)1/2
- C. Ac√R.S
- D. A (c.A/pi) 1/2
Explanation: Chezy's equation gives mean velocity as C√(RS), where R is hydraulic radius and S is the energy or channel slope.
Correct answer: Ac√R.S- A. d/2
- B. d/3
- C. d/4
- D. d/6
Explanation: Hydraulic mean depth here means hydraulic radius, equal to flow area divided by wetted perimeter.
Correct answer: d/4- A. 4fLv2/gd
- B. 4fLv2/2gd
- C. 4fLv/gd
- D. 4fLv/2gd
Explanation: Darcy-Weisbach loss is h_f = 4f(L/D)(v²/2g) when f is the commonly used Fanning friction factor; this is option b.
Correct answer: 4fLv2/2gd