Irrigation Engineering Online Test - Paper 3 »Exclusive Quiz

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Total Questions: 50
Time Allotted: 50 minutes
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1 / 50

1. *The maximum amount of water required in the case of paddy is at the time of

a) puddling

b) seeding

c) harvesting

d) flowering

2 / 50

2. *Bed bars in a canal are provided

a) to raise the supply level

b) to measure the discharge

c) to watch the general behavior of the canal

d) to control the silting

3 / 50

3. The effective precipitation for a crop is the water which is equal to

a) water stored in the soil within the root zone of the crop

b) total precipitation during the crop period

c) total precipitation minus the loss due to infiltration

d) none of the above

4 / 50

4. A sudden fall of the level of the ground along the alignment of the canal joined by an inclined bed is called a

a) jump

b) sudden fall

c) rapid fall

d) hydraulic jump

5 / 50

5. A canal used to drain off water from waterlogged areas is

a) ditch canal

b) drain canal

c) perennial canal

d) none of the above

6 / 50

6. According to Kennedy's theory, the silt supporting eddies are generated due to

a) roughness of the bed

b) roughness of the sides

c) both (a) and (b) above

d) none of the above

7 / 50

7. *The discharge through a channel is maximum when

a) d = b/3

b) m = d/2

c) d = b

d) b = 1.5d

8 / 50

8. *A device provided near weirs or dams to facilitate the migration of fish upstream or downstream around the weirs is called

a) fish net

b) fish ladder

c) fish channel

d) fish pond

9 / 50

9. A canal, constructed by the side of and generally parallel to the parent canal with a different bed slope is called

a) parallel canal

b) ditch canal

c) drain canal

d) side canal

10 / 50

10. *A divide wall is provided to

a) control the silt entering the canal

b) separate the under sluices from the weir proper

c) prevent river flood entering the canal

d) all of the above

11 / 50

11. In a canal syphon, flow is

a) pipe flow

b) under negative pressure

c) under atmospheric pressure

d) none of the above

12 / 50

12. *A silt regulator located at the head of a channel is called

a) silt ejector

b) silt excluder

c) silt sweeper

d) silt washer

13 / 50

13. The sudden and turbulent passage of water from a low level critical depth to high level above critical depth, during which the velocity passes from supercritical to subcritical, is known as

a) jump

b) hydraulic jump

c) sudden fall

d) all of the above

14 / 50

14. *Bell bunds are

a) guide bands for training a river at the site of a bridge or weir

b) barriers made of timber, filled with stone or other suitable material

c) fixed distances over which surface floats are lined

d) none of the above

15 / 50

15. The most suitable location of a canal headwork is

a) boulders stage of the river

b) delta stage of the river

c) rock stage of the river

d) trough stage of the river

16 / 50

16. *A deep well

a) is always deeper than a shallow well

b) has more discharge than a shallow well

c) is structurally weaker than a shallow well

d) both A and B above

17 / 50

17. The maximum quantity of water that can be supplied from the reservoir with full guarantee during the worst dry period is known as

a) safe yield

b) design yield

c) secondary yield

d) average yield

18 / 50

18. The volume of water stored between normal pool level and the maximum pool level is known as

a) bank storage

b) surcharge storage

c) useful storage

d) deep storage

19 / 50

19. *The meandering river is always

a) maximum discharge

b) average discharge

c) dominant discharge

d) none of the above

20 / 50

20. The floor of an aqueduct is subjected to uplift pressure due to

a) seepage of water from the canal to the drainage

b) subsoil water table in the drainage bed

c) both (a) and (b) above

d) none of the above

21 / 50

21. *The crops require maximum water during

a) first watering when the crop has grown a few centimeters

b) first watering before sowing the crops

c) last watering before harvesting

d) all of the above

22 / 50

22. If the RLs of canal bed level and HFL of drainage are 202.0 m and 200.0 m respectively, then the cross drainage work will be

a) an aqueduct

b) siphon

c) syphon aqueduct

d) super passage

23 / 50

23. Find the delta for a crop if the base period and duty are 110 days and 1400 he/cumec respectively.

a) 38 cm

b) 48 cm

c) 58 cm

d) 68 cm

24 / 50

24. *Meandering of rivers is caused by

a) excessive discharge during the floods, when turbulence is developed

b) increase in width

c) heavy deposition

d) all of the above

25 / 50

25. *The consumptive use of water for a crop

a) is measured as the volume of water per unit area

b) is measured as the depth of water on the irrigated area

c) may be supplied partly by precipitation and partly by irrigation

d) all of the above

26 / 50

26. Percolation loss is less in the case of

a) sandy soil

b) black cotton soil

c) silty soil

d) all of the above

27 / 50

27. *The maximum velocity in a circular channel of diameter D occurs when the depth of flow is

a) 3.50 D

b) 0.73 D

c) 0.81 D

d) 0.90 D

28 / 50

28. *Which of the following is not a cross drainage work?

a) aqueduct

b) super passage

c) level crossing

d) drain crossing

29 / 50

29. *The major resisting force in a gravity dam is

a) uplift pressure

b) water pressure

c) self-weight

d) wave pressure

30 / 50

30. *The phenomenon of salts coming up in solution and forming a layer of crust on the surface after the evaporation of water is known as

a) reclamation

b) leaching

c) efflorescence

d) salinity

31 / 50

31. Horizontal acceleration due to an earthquake results in

a) hydrodynamic pressure

b) inertia force into the body of the dam

c) both (a) and (b) of above

d) none of the above

32 / 50

32. The silting in a channel occurs due to

a) defective outlet

b) defective head regulator

c) channel not in regime

d) all of the above

33 / 50

33. The relation between duty (D) in hectares/cumec depth of water in meters and base period (B) in days is given by

a) Δ = 8.64 B / D

b) Δ = 8.64 D / B

c) Δ = 8.64 B

d) none of the above

34 / 50

34. The capacity of a reservoir is 50 million cubic meters, and dead storage is 12 million cubic meters. If the average volume of sediment deposition is 0.1 million cubic meters per year, then the usefulness of the reservoir will start reducing after

a) 40 years

b) 100 years

c) 120 years

d) 250 years

35 / 50

35. *The process by which unculturable soil made culturable is known as

a) reclamation

b) leaching

c) efflorescence

d) salinity

36 / 50

36. *Due to topography, if the space is not available, the most suitable spillway is

a) ogee spillway

b) chute spillway

c) shaft spillway

d) straight drop spillway

37 / 50

37. *Groynes are provided

a) traverse to the river

b) longitudinal to the river

c) parallel to the river

d) none of the above

38 / 50

38. *After entering the canal, sediments are removed by the

a) silt ejector

b) silt excluder

c) silt regulator

d) none of the above

39 / 50

39. *In a syphon aqueduct, the maximum uplift pressure on the floor occurs when

a) the canal is full

b) the canal is full and drainage is dry

c) the canal is empty and the water table in the stream rises to the canal bed

d) both canal and drainage are full

40 / 50

40. The weir is generally aligned at a right angle to the direction of the main river flow because

a) it gives better discharge capacity

b) less length of weir is required

c) it is economical

d) all of the above

41 / 50

41. *The obstruction across the river required to raise its water level and divert the water into the canal is called

a) weir or anicut

b) divide wall

c) guide bank

d) under sluice

42 / 50

42. Which of the following crops are in Rabi groups?

a) groundnut

b) sugar cane

c) bajra

d) none of the above

43 / 50

43. The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as

a) water conveyance efficiency

b) water application efficiency

c) water use efficiency

d) any of the above

44 / 50

44. A protection at the downstream end of a weir or fall, consisting of blocks of concrete or masonry, is called

a) scour

b) baffles

c) talus

d) flank wall

45 / 50

45. According to Khosla's theory, the exit gradient in the absence of a downstream cutoff is

a) zero

b) unity

c) infinity

d) none of the above

46 / 50

46. *When the water table is within the root zone depth and is detrimental to plant life, the land is said to be

a) over nourished

b) super-saturated

c) waterlogged

d) undernourished

47 / 50

47. The most commonly adopted method of irrigation for cereal crops is

a) furrow flooding

b) border flooding

c) check flooding

d) free flooding

48 / 50

48. The main advantage of lining an irrigation channel is

a) a reduction in the loss of water due to seepage

b) economy in the use of cultivable land which would otherwise be prone to water logging

c) withstand higher velocities so causing a proportional reduction in cross-sectional area

d) all of the above

49 / 50

49. Tortuosity of a meandering river is the ratio of

a) meander length and meander belt

b) curved length along the channel to the direct axial length of the river reach

c) direct axial length of the river reach to the curved length of the channel

d) meander belt to meander length

50 / 50

50. Boron concentration in water for irrigation should be limited to

a) 2 ppm

b) 20 ppm

c) 200 ppm

d) 500 ppm

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