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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 13 of 14

241. Volume of water that unit volume of aquifer will give up by gravity pull is called ____________________?

  • A. Specific volume
  • B. Specific retention
  • C. Specific yield
  • D. All are correct

Explanation: Specific yield is the volume of water that a unit volume of saturated aquifer releases under gravity.

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Correct answer: Specific yield

242. An aquifer in which water contained under high pressure as the' aquifer is sand witched between two impervious layer is called___________________?

  • A. Confined aquifer
  • B. Un-confined aquifer
  • C. No-Artesian aquifer
  • D. All are correct

Explanation: A confined aquifer is trapped between relatively impervious layers, so its groundwater is under pressure and may rise above the aquifer…

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Correct answer: Confined aquifer

243. __________% of total global water is saline and available in oceans ?

  • A. 95%
  • B. 96%
  • C. 97%
  • D. 97.5%

Explanation: About 97.5% of the Earth’s water is saline, mostly contained in oceans, while only about 2.5% is freshwater.

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Correct answer: 97.5%

244. Readily available moisture is the % of moisture that is always easily available to plant and this moisture is called _________________?

  • A. 70%
  • B. 75%
  • C. 80%
  • D. 85%

Explanation: In the conventional irrigation classification used in such texts, readily available moisture is taken as about 80% of the available soil…

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Correct answer: 80%

245. Water available in root zone of plants, is about 50% of soil moisture content. which is always available to the plants is called________________?

  • A. Effective water
  • B. Soil-moisture content
  • C. All are correct
  • D. Capillary water

Explanation: Capillary water is held in the small pores of soil and forms the main water supply available to plant roots.

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Correct answer: Capillary water

246. Water storage efficiency in the root zone depends upon__________________?

  • A. Porosity
  • B. Fine particles of soil
  • C. Coarse particles of soil
  • D. Climatic conditions

Explanation: Root-zone water storage is closely related to soil porosity, because pore spaces determine how much water the soil can retain after…

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Correct answer: Porosity

247. Tanda dam is constructed on river ___________________?

  • A. Haro
  • B. Kohat
  • C. Kabul
  • D. Hub

Explanation: Tanda Dam is associated with the Kohat region and is constructed across the Kohat stream or river system.

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Correct answer: Kohat

248. When reservoir is full on upstream side, the maximum stress comes upon__________________?

  • A. Top of dam
  • B. Face of dam
  • C. Bottom of dam
  • D. All are correct

Explanation: Hydrostatic water pressure increases with depth, so the greatest lateral water pressure and resulting stress occur near the bottom of the…

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Correct answer: Bottom of dam

249. The steep conduits made in the body of dam for running turbines to generate hydro-electric power are called__________________?

  • A. Tunnels
  • B. Chuttes
  • C. Weep holes
  • D. Penstocks

Explanation: Penstocks are strong, steep pipes or conduits that carry pressurized water from a reservoir or forebay to hydroelectric turbines.

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Correct answer: Penstocks

250. The resultant pressure of water on the face of dam is equal to ____________________ ?

  • A. 1/2 WH2
  • B. 1/2 WH
  • C. WH
  • D. All are correct

Explanation: Hydrostatic pressure increases uniformly with depth, producing a triangular pressure distribution whose resultant is one-half the unit…

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Correct answer: 1/2 WH2

251. Always flow inside the ground is ____________________?

  • A. Turbulent
  • B. Laminar
  • C. Rotational
  • D. Compressible

Explanation: Groundwater moves through very small pore spaces at low velocity, so viscous forces dominate and the flow is generally laminar.

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Correct answer: Laminar

252. Sterilization is the process of killing ___________ of water borne diseases, so as to make it safe for hospital use?

  • A. Algai bacteria
  • B. Fungi bacteria i
  • C. Pathogenic bacteria
  • D. Insects

Explanation: Sterilization aims to destroy pathogenic microorganisms, especially disease-causing bacteria, in water.

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Correct answer: Pathogenic bacteria

253. The permissible limit of hardness of water fore low pressure boiler is _____________________?

  • A. 30 mg/litre
  • B. 40 mg/litre
  • C. 50 mg/litre
  • D. 60 mg/litre

Explanation: For a low-pressure boiler, the commonly specified permissible hardness of feed water is about 50 mg/L, expressed as calcium carbonate.

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Correct answer: 50 mg/litre

254. An escape constructed with masonry or pitched with stones to dispose off surplus of tank or reservoir is called________________?

  • A. paved-escape
  • B. Bye-wash
  • C. Water escape
  • D. Disposal channel

Explanation: A paved escape is an escape channel lined with masonry or pitching stones to safely carry surplus water away from a tank or reservoir.

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Correct answer: paved-escape

255. Surface tension is the property of a liquid which enables it to resist tensile stress. the surface tension of water is equal to ______________ Kg/m?

  • A. 0.0056
  • B. 0.006
  • C. 0.0065
  • D. 0.0075

Explanation: The surface tension of water near ordinary temperatures is approximately 0.0075 kg/m, equivalent to about 0.073 N/m.

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Correct answer: 0.0075

256. The dam built for the purpose of diverting water from main stream to various courses of flow is called ____________________?

  • A. Coffer dam
  • B. Detention dam
  • C. Gravity dam
  • D. Diversion dam

Explanation: A diversion dam raises or redirects part of a stream's flow into canals or other intended watercourses.

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Correct answer: Diversion dam

257. In case of silt deposition in the dam reservoir to dispose of the effectively ________________ be used?

  • A. Vortex pipes
  • B. Silt excluders
  • C. Silt ejectors
  • D. All are correct

Explanation: Vortex pipes are used to draw off and flush deposited silt from a reservoir or dam basin.

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Correct answer: Vortex pipes

258. To dispose of the surplus water from dam, a water way is constructed called________________?

  • A. Water escape
  • B. Spillway
  • C. Channel
  • D. All are correct

Explanation: A spillway is the specially designed waterway that safely releases surplus reservoir water downstream when the water level exceeds the…

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Correct answer: Spillway

259. A dam which the up lift pressure of the sub-soil water by its own weight is called _________________?

  • A. Buttress dam
  • B. Arch dam
  • C. Concrete dam
  • D. Gravity dam

Explanation: A gravity dam relies mainly on its massive self-weight to resist water pressure, uplift, and sliding.

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Correct answer: Gravity dam

260. A channel artificially constructed for water conveyance of appreciable quantities with no problem of silting and scouring is called ____________________?

  • A. A and B are correct
  • B. Stable canal
  • C. Alluvial canal
  • D. A regime canal

Explanation: A regime or stable canal is designed to convey water without progressive silting or scouring, with its dimensions and flow conditions in…

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Correct answer: A and B are correct
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