Irrigation Engineering MCQ Questions & Answers | Civil Engineering

Irrigation Engineering Mcq

part-01

 01) 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

Answer: Option D (All the above)

 02)  Canals taken off from ice-fed perennial rivers, are known

(A) Permanent canals

(B) Ridge canals

(C) Perennial canals

(D) Inundation canals

Answer: Option C (Perennial canals)

03) In gravity canals, F.S.L. is

(A) Always at the ground level

(B) Always below the ground level

(C) Generally 4 to 5 metres above the ground level

(D) Only a few cm above the ground level

Answer: Option D

 04) The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is

(A) 8 cm

(B) 10 cm

(C) 12 cm

(D) 14 cm

Answer: Option C (12 cm)

 05) If water table is comparatively high, the irrigation canal becomes useless, due to

(A) Large amount of seepage

(B) Water logging of the cultivated areas

(C) Uncertain water demand

(D) All the above

Answer: Option D (All the above)

 06) If A is the area of the surface, X Is the depth of it's C.G from the surface of the water and W is the density of water,than? 

(A)Total pressure on the surface is WX

(B) Depth of the point at which total pressure acts is equal to its moment of inertia divided by AX

(C) Depth of the centre of pressure is 2/3H vertically below the surface

(D) All the above

Answer: Option D (All the above)

 07) In a syphon aqueduct

(A) Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough

(B) Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough

(C) Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough

(D) Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough

Answer: Option C (Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough)

08) If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation ?

(A) t = (h + 1)/(G + t)

(B) t = (h - 1)/(G + t)

(C) t = (h - 1)/(G - t)

(D) t = (h + 1)/G

Answer: Option C ( t = (h - 1)/(G - t))

 09) To hold hydraulic jumps, baffle walls are provided in

(A) Sarda type falls

(B) English type falls

(C) Montague type falls

(D) Vertical type falls

Answer: Option B (English type falls)

irrigation-engineering-multiple-choice-question

 10) Pick up the correct sequence of the part of a canal system from the following

(A) Head work-distributary-branch canal-minor

(B) Head works-main canal-branch canal-distributary-minor

(C) Head works-main canal-branch canal-minor-distributary

(D) Heads works-branch canal-main canal distributary, minor

Answer: Option B ( Head works-main canal-branch canal-distributary-minor)

 11) The field capacity of a soil depends upon

(A) Capillary tension in soil

(B) Porosity of soil

(C) Both (a) and (b)

(D) Neither (a) nor (b)

Answer: Option C (Both (a) and (b))

 12) The water face of the guide banks, is protected by

(A) One men stone pitching

(B) Two man stone pitching

(C) Three man stone pitching

(D) Four man stone pitching

Answer: Option A (One men stone pitching)

13) Pick up the correct statement from the following

(A) Escapes are essential safety valves in a canal system

(B) The escapes must lead the surplus water to natural drainages

(C) The escapes are aligned to take advantage of contours of lower values

(D) All the above

Answer: Option D (All the above)

 14) For a unique design of a channel by Kennedy's theory

(A) Its breadth must only be known

(B) Its depth must only be known

(C) Its breadth and depth ratio must only be known

(D) All the above

Answer: Option C (Its breadth and depth ratio must only be known)

15) The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called ?

(A) Syphon

(B) Super passage

(C) Super-aqueduct

(D) Syphon aqueduct

Answer: Option D (Syphon aqueduct)

 16) The main cause of silting up a channel ?

(A) Non-regime section

(B) Inadequate slope

(C) Defective head regulator

(D) All the above

Answer: Option D (All the above)

 17) Pick up the correct statement from the following ?

(A) Gravity water is harmful to crops

(B) Hygroscopic water remains attached to soil molecules by chemical bond

(C) Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants

(D) All the above

Answer: Option C ( Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants)

 18) A river training work is generally required when the river is

(A) Meandering

(B) Aggrading

(C) Degrading

(D) All the above

Answer: Option A (Meandering)

 19 ) When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called ?

(A) Syphon

(B) Aqueduct

(C) Super passage

(D) Syphon-aqueduct

Answer: Option C (Super passage)

 20) Pick up the correct statement from the following

(A) In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal

(B) In a level crossing a regulator is provided across the drainage at its down-stream

(C) In a level crossing, a cross regulator is provided on the canal below the crossing

(D) All the above

Answer: Option D (All the above)

Irrigation Engineering Mcq PART -02 

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