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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 5 of 14

81. A module or outlet in which discharge depends upon the difference of head between distributary and the water course is called ___________________?

  • A. Modular
  • B. Non-modular
  • C. Semi-modular
  • D. Rigid module

Explanation: A non-modular outlet has discharge governed by the difference in head between the distributary and the watercourse.

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Correct answer: Non-modular

82. An outlet through which the discharge depends upon the water level in the distributary is called ___________________?

  • A. Rigid module
  • B. Non-flexible
  • C. Flexible module
  • D. Non-modular

Explanation: A flexible module, also corresponding to a semi-modular outlet in this classification, has discharge controlled mainly by the water level…

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Correct answer: Flexible module

83. The ratio of the rate of change of discharge through out let to the rate of c./v of water level of the distributary is called_________________?

  • A. Sensitivity
  • B. Proportionally
  • C. Setting
  • D. Flexibility

Explanation: Sensitivity is the rate of change of outlet discharge per unit change in the distributary water level, expressed as dQ/dH.

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Correct answer: Sensitivity

84. When FSL of the canal is sufficiently below the bottom of the drain, so that water flows freely under gravity, such structures is called_____________________?

  • A. Syphon
  • B. Super-passage
  • C. Syphon - Aqueduct
  • D. Canal-syphon

Explanation: In a super-passage, the drain passes over the canal while the canal flows freely under gravity below the drain bed.

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Correct answer: Super-passage

85. A structure provided when a large canal a big drainage channel approach other practically at the same level is called__________________?

  • A. Super passage
  • B. Canal crossing
  • C. Level crossing
  • D. Drainage crossing

Explanation: When a canal and a drainage channel meet at nearly the same bed level, the cross-drainage structure is a level crossing.

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Correct answer: Level crossing

86. An open cut in the canal bank. with bed and sides to escape canal water through a lead channel to mix water in a nearby drain is called _____________________?

  • A. Inlet
  • B. Exit
  • C. Module
  • D. Out let

Explanation: An outlet is an opening in the canal bank that carries excess canal water through a lead channel into a nearby drain.

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Correct answer: Out let

87. The total dissolved solids in drinking water should not exceed_________________?

  • A. 1000 mg/litre
  • B. 1200 mg/litre
  • C. 1300 mg/litre
  • D. 1500 mg/litre

Explanation: A commonly used permissible upper limit for total dissolved solids in drinking water is 1500 mg/L, although lower values are preferred for…

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Correct answer: 1500 mg/litre

88. Darcy formula for loss of head in pipes is given by, hf=4fl v2 / __________________?

  • A. g2d
  • B. gd
  • C. 2gd
  • D. gd2

Explanation: Using the Darcy-Weisbach convention in the question, head loss is given by hf = 4fLv²/(2gd).

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Correct answer: 2gd

89. Velocity of flow in a sewer must be form ______________ to ?

  • A. 4.5 ml sec to 5 m/ sec
  • B. 3m / sec to 4m/ sec
  • C. 4m / sec to 4.5 ml sec
  • D. 1 m / sec to 3m/ sec

Explanation: A sewer is commonly designed for a flow velocity of about 1 to 3 m/s, balancing self-cleansing action against excessive scouring and…

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Correct answer: 1 m / sec to 3m/ sec

90. A digging out of earth to make trench for any engineering purpose is called ______________________?

  • A. Excavation
  • B. Cavitations
  • C. borrow pitting
  • D. Earth filling

Explanation: Excavation means removing earth to form a trench, foundation or other required cut for engineering work.

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Correct answer: Excavation

91. The water in swimming pools can be ____________ by using any one from the following, chlorine-ultraviolet rays and bromine t ?

  • A. Disinfected
  • B. Infected
  • C. Cleaned
  • D. Iodized

Explanation: Chlorine, ultraviolet radiation and bromine are used to disinfect swimming-pool water by destroying or inactivating disease-causing…

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Correct answer: Disinfected

92. Mostly the salt of calcium and Magnesium can not cause ________________?

  • A. Salinity
  • B. Poisoning
  • C. Alkalinity
  • D. Turbidity

Explanation: Calcium and magnesium salts commonly cause hardness and may contribute to salinity or alkalinity, but they are not ordinarily classified…

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Correct answer: Poisoning

93. An open cut given in a canal bank, suitably protected by stone pitching to the upland drainage water into the canal is called ___________________?

  • A. entrance
  • B. Out let
  • C. Inlet
  • D. Mixing

Explanation: An inlet is an opening cut in the canal bank to admit upland drainage water, with stone pitching protecting the bank from erosion.

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Correct answer: Inlet

94. When FSL of the canal is sufficiently above the bed level of drainage so that canal flows under syphonis action, the structure is called _____________________?

  • A. Super passage
  • B. Syphon - Aqueduct
  • C. Aqueduct
  • D. Canal-syphon

Explanation: When the canal passes below the drainage and flows under pressure or siphonic action, the cross-drainage work is called a canal-siphon.

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Correct answer: Canal-syphon

95. When the high flood level of the drain is sufficiently below the bed of the Canal that the drainage water flows freely under gravity, such structure is called___________________?

  • A. Syphon-aqueduct
  • B. Aqueduct
  • C. Cross-Drainage
  • D. Non-gravity structure

Explanation: An aqueduct carries the canal over the drain, allowing the drainage water to pass below freely under gravity.

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Correct answer: Aqueduct

96. When the rate of change of discharge of outlet equals the rate of change of discharge of the channel, the out let is called __________________?

  • A. Sensitive
  • B. Flexible
  • C. Proportional
  • D. Non-flexible

Explanation: A proportional outlet changes its discharge in the same proportion as the discharge of the parent channel.

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Correct answer: Proportional

97. A module or outlet in which discharge is fixed and limited, irrespective fluctuations in water levels in distributary is called _________________?

  • A. Semi - Rigid
  • B. Non-modular
  • C. Semi-modular
  • D. Modular

Explanation: A modular outlet delivers a fixed discharge within its designed operating range, largely independent of fluctuations in distributary water…

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Correct answer: Modular

98. The inverted filter consists layer of materials of increasing ______________ from bottom to top?

  • A. Permeability
  • B. Under mining
  • C. Piping
  • D. Up thrust pressure

Explanation: An inverted filter is arranged so that seepage encounters progressively more permeable material in the direction of flow.

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Correct answer: Permeability

99. The invented filter is provided just after the end of concrete floor to reduce () possibility of _________________?

  • A. Piping
  • B. Under mining
  • C. a and b are correct
  • D. Up thrust

Explanation: Placed beyond the concrete floor, an inverted filter safely releases seepage and prevents the removal of soil particles.

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Correct answer: a and b are correct

100. Khosla provided a seepage theory for design of Hydraulic structures called________________?

  • A. Theory of seepage
  • B. Creep theory
  • C. Method of cutoffs
  • D. Method of independent variables

Explanation: Khosla analysed seepage beneath hydraulic structures using the method of independent variables, which relates seepage pressures and…

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Correct answer: Method of independent variables
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