Irrigation Engineering MCQ Questions & Answers

31

A 70% index of wetness means

A) rain excess of 30% B) rain deficiency of 30% C) rain deficiency of 70% D) none of the above

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Answer & Solution

Answer: Option B

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32

Useful soil moisture for plant growth, is

A) Capillary water B) Gravity water C) Hygroscopic water D) Chemical water

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Answer & Solution

Answer: Option A

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33

The state of the soil when plants fail to extract sufficient water for their requirements, is

A) Maximum saturated point B) Permanent wilting point C) Ultimate utilization point D) None of these

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Answer & Solution

Answer: Option B

Solution:

The correct answer is Permanent wilting point.

In irrigation engineering, the term Permanent wilting point refers to the state of the soil when plants are unable to extract sufficient water for their needs. At this point, the soil moisture content is so low that plants wilt permanently, even if moisture is added to the soil.

So, the sentence should read: "The state of the soil when plants fail to extract sufficient water for their requirements, is Permanent wilting point."

34

The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are

A) At right angle and parallel to weir crest B) Parallel and at right angle to weir crest C) Parallel to weir crest in both D) At right angle to weir crest in both

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Answer & Solution

Answer: Option A

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35

V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is

A) $$\frac{{2{{\text{V}}^2}}}{{\sqrt 3 {\text{R}}}}$$ B) $$\frac{{3{{\text{V}}^2}}}{{4{\text{R}}}}$$ C) $$\frac{{5{{\text{V}}^2}}}{{2{\text{R}}}}$$ D) $$\frac{{2{{\text{V}}^2}}}{{5{\text{R}}}}$$

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Answer & Solution

Answer: Option C

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36

The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of

A) Reverse curve B) Next curve of the same order C) Reverse curve plus the width of the river D) None of these

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Answer & Solution

Answer: Option B

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37

A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If ϕ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is

A) 4.5 cm B) 6.0 cm C) 7.5 cm D) 9.0 cm

Discuss

Answer & Solution

Answer: Option B

Solution:

Infiltration Rate =2/6=1/3cm/hr
Infiltration=1/3*12=4cm
Run-off= 10-4=6 cm

38

A multipurpose reservoir is the one which is

A) designed for one purpose but serves more than one purpose B) planned and constructed to serve various purposes C) both (A) and (B) D) none of the above

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Answer & Solution

Answer: Option B

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39

A divide wall is provided

A) At right angle to the axis of weir B) Parallel to the axis of weir and upstream of it C) Parallel to the axis of weir and downstream of it D) At an inclination to the axis of weir

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Answer & Solution

Answer: Option A

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40

The consumptive use of water for a crop

A) Is measured as the volume of water per unit area B) Is measured as depth of water on irrigated area C) May be supplied partly by precipitation and partly by irrigation D) All the above

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Answer & Solution

Answer: Option D

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Irrigation Engineering MCQ Questions & Answers | Civil Engineering