07 Civil Engineering Quiz | Irrigation MCQ #mcq.cetjob.com

07 Civil Engineering Quiz | Irrigation MCQ

1 >>Pick up the incorrect statement from the following
 ?

• (A) Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
• (B) Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary
• (C) Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
• (D) None of these.

2 >>F.S.L. of a canal at its head with respect to parent channel is kept
 ?

• (A) 15 cm lower
• (B) 15 cm higher
• (C) at the same level
• (D) None of these.

3 >>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

4 >>For the stability of a structure against seepage pressure according to Khosla’s creep theory, the critical gradient is
 ?

• (A) 0
• (B) 1
• (C) 0.5
• (D) 0.25

5 >>For the design of major hydraulic structures on the canals, the method generally preferred to, is based on
 ?

• (A) Khosla's method of independent variables.
• (B) Bligh's theory
• (C) The relaxation method
• (D) Electrical analogy method

6 >>Retrogression of the bed level of a river downstream a weir, occurs due to
 ?

• (A) soft soil strata.
• (B) less percentage of silt
• (C) increase of the bed level
• (D) heavy impact of water

7 >>Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less
 ?

• (A) populated area
• (B) fallow land.
• (C) alkaline area
• (D) forest area

8 >>In a canal syphon, the flow is
 ?

• (A) under atmospheric pressure
• (B) pipe flow
• (C) with critical velocity
• (D) under negative pressure.

9 >>Attracting groynes are built
 ?

• (A) inclined up stream
• (B) perpendicular to the bank
• (C) inclined down stream
• (D) none of these.

10 >>The difference in level between the top of a bank and supply level in a canal, is called
 ?

• (A) free board
• (B) berm
• (C) height of bank
• (D) none of these

11 >>The top of the capillary zone
 ?

• (A) lies above the water table at every point
• (B) lies below the water table at every point
• (C) coincides the water table at every point
• (D) none of these

12 >>A water-logged land is found suitable for cultivation due to
 ?

• (A) absence of aeration of soil from root zone of the plant
• (B) ease of tillage for preparation of the field for optimum condition of germination
• (C) regular supply of water to plants from the water table by capillary action
• (D) none of these

13 >>Irrigation canals are generally aligned along
 ?

• (A) contour line
• (B) straight line.
• (C) valley line
• (D) ridge line

14 >>Groynes are generally built
 ?

• (A) inclined up stream up to 30°
• (B) inclined down stream upto 30°
• (C) perpendicular to the bank
• (D) all

15 >>When a canal is carried over a natural drainage, the structure provided, is known as
 ?

• (A) syphon
• (B) super passage
• (C) syphon-aqueduct.
• (D) aqueduct

16 >>In a Sarda type fall, the rectangular crest, may be used for discharge upto
 ?

• (A) 14 cumecs
• (B) 20 cumecs
• (C) 10 cumecs
• (D) 6 cumecs

17 >>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

18 >>Pick up the incorrect statement from the following:
 ?

• (A) In furrow irrigation water is admitted between the rows of plants in the field
• (B) In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area
• (C) In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn
• (D) none of these

19 >>Borrow pits should preferably be located in
 ?

• (A) central half width of the section of the canal.
• (B) fields on both sides of the canal
• (C) field on the left side of the canal
• (D) field on the right side of the canal

20 >>When a canal and a drainage approach each other at the same level, the structure so provided, is
 ?

• (A) inlet and outlet.
• (B) an aqueduct
• (C) a level crossing
• (D) a syphon

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