SUBJECT 2 : SOIL & WATER RESOURCE DEVELOPMENT & CONSERVATION,

IRRIGATION AND DRAINAGE, AGRICULTURAL SCIENCES & INFORMATION

TECHNOLOGY, MATHEMATICS, AGRI STATISTICS AND OPERATIONS RESEARCH

1. It is an arrow represents an activity with zero time duration. It is represented by a

dotted line and
is introduced in a network to clarify activity pattern under the following situations:
i. It is created to make activities with common starting and finishing events
distinguishable
ii. To identify and maintain the proper precedence relationship between activities
those are not connected by events.
a. operation research arrow
c. gummy arrow
b. dummy arrow
d. county arrow
2. An open chamber rests on the ocean floor in 160 feet of sea water (SG=1.03). The
air pressure in psig that must be maintained inside to exclude water in nearest to
a. 45.2
b. 60.9
c. 71.4
d. 93.2
3. The horsepower required in the absence of losses to pump water at 100 gallons per
minute from a large reservoir to another large reservoir 400 feet higher is nearest to
a. 6
b. 10
c. 18
d. 35
4. A trapezoidal channel having a base width of 12 m and a depth of 4 m has a
sideslope of 2 horizontal to 1 vertical. Find the hydraulic radius.
a. 2.68
b. 1.86
c. 2.34
d.3.86
5. The main source of ground water is
a. precipitation
b. evaporation
c. spring water
d. underground water
6. It is the ratio of the particle density of the soil with the density of water.
a. Bulk Density
c. Apparent Specific Gravity
b. Particle Density
d. Real Specific Gravity
7. It is the ratio of the dry weight of the soil to the volume of the soil particles.
a. Bulk Density
c. Apparent Specific Gravity
b. Particle Density
d. Real Specific Gravity
8. The time rate at which water will percolate into the soil.
a. percolation rate
c. infiltration rate
b. precipitation rate
d. seepage
9. Boolean algebra is essentially based on
a. numbers
c. truth
b. logic
d. symbols
10. One byte of memory will contain ____ bits.
a. 4
b. 8
c. 16
d. 32
11. A group of electronic, magnetic or mechanical devices that store data is called
a. program
b. address
c. register
d. software
12-17. A sharp edged cylinder 7.5 cm in diameter is carefully driven into the soil so that
negligible compaction occurs. A 12-cm column of soil is obtained. The fresh and dry
masses of the soil sample are 910.6 grams and 736.3 grams respectively. Assume that
the particle density of the soil is 2.60 g/cm3.
12. Determine the Total Volume.
a. 534.104 cubic centimeter
c. 534.410 cubic centimeter
b. 531.044 cubic centimeter
d. 530.144 cubic centimeter
13. Determine the percent porosity.
a. 45.68%
b. 48.56%
c. 45.86%
d. 46.58%
14. Determine Depth of Water present in the soil column.
a. 3.849 cm
b. 3.498 cm
c. 4.938 cm
d. 3.948 cm
15. Determine the Soil moisture content by volume.
a. 32.90%
b. 32.09%
c. 30.92%
d. 30.29%
16. Determine the Soil moisture content by dry weight.
a. 26.37%
b. 23.67%
c. 23.76%
d. 26.73%
17. Determine the Apparent Specific Gravity.
a. 1.93
b. 1.92
c. 1.39
d. 1.38
18. Which of the following is true about Field Capacity?
a. The amount of water a soil profile will hold against drainage by gravity at a specified
time ( usually from 24 hours to 48 hours) after a thorough wetting.
b. It is also the moisture content of the soil when gravitational water has been removed
( after irrigation by flooding).
c. The soil moisture tension at this point is normally between 1/10 to 1/3 atmosphere.
d. all of the choices
19. The static level of water in wells penetrating the zone of saturation is
a. water table
c. aquifer level
b. hydrostatic level
d. artesian level
20. A circular channel has a radius of 1.5 m and has a depth of flow of 1.8 m.
Determine the hydraulic
radius.
a. 0.786
b. 0.875
c. 0.833
d. 0.958
21. Any breeding female pig that has farrowed.
a.gilt
b. sow
c. litter
d. weaner
22. A mature male goat.
a. Doe
b. lamb
c. buck
d. ram
23. One thousand two hundred and fifty cubic meters of water was delivered to a 10 ha
farm for the month of June in which the consumptive use is estimated at 8 mm/day.
The effective rainful for the period was 150 mm. What is the irrigation efficiency?
a. 72%
b. 73%
c. 74%
d. 71%
24. Determine the irrigation interval for a farm with soil root zone having a field
capacity of 200 mm and a wilting point of 105 mm. Assume the consumptive use for
August is 7.5 mm/day with no rainful and the allowable moisture depletion is 75%
a. 9 days
b. 10 days
c. 11 days
d. 12 days
25. The total rainful for the month of May was 600 mm as measured by a USWB
standard rainguage (8 inches in diameter). Determine the average daily rainful for the
month.
a. 19.4 mm
b. 14.9 mm
c. 90.4 mm
d. 49.0 mm
26. What three consecutive even numbers have their sum equal to 378?
a. 126,128,130
b. 124, 126, 128
c. 122, 124, 126
d. 120, 122, 124
27. Scientific name for Rice
a. Oryza sativa
b. Oryza Sativa
c. Zea mays
d. Zea Mays
28. Leucaena leucocephala refers to
a. Mahogany
b. Narra
c. Ipil-Ipil
d. Tropical Kudzu
29. It refers to impregnation or fertilization.
a. Gestation
b. Fecundation
c. Lactation
d. Mastication
30. It is a natural or synthetic hydrograph for one unit of direct runoff from the
catchment in a specified unit of time.
a. basic hydrograph
b. design hydrograph
c. runoff hydrograph
d. unit hydrograph
31. The rate of vertical water movement through the soil at saturated condition is
a. infiltration rate
c. depletion rate
b. percolation rate
d. soil permeability
32. What is the base of the most efficient trapezoidal concrete open channel if
discharge is 100 cubic meter per second and velocity is 2 m/s.
a. 6.41 meter
b. 6.14 meter
c. 4.16 meter
d. 4.61 meter
33. What is the bottom width for best hydraulic cross-section of unlined open channel
for
minimum seepage if design depth is 5 meters and side slope is 45º?
a. 8.02 meter
b. 8.20 meter
c. 2.80 meter
d. 2.08 meter
34. Type of precipitation associated with the movement of air masses from high
pressure regions to low pressure regions.
a. cyclonic precipitation
c. convective precipitation
b. orographic precipitation
d. artificial precipitation
35. A coin is flipped five times and comes up head each time. What is the probability
that it will come up head on the six flip?
a. 0.5
b. 0.2
c. 0.3
d. 0.4
36. You have a bag of marbles. There are 3 red matbles, 2 green marbles, 7 yellow
marbles and 3 blue marbles. What is the probabilty of drawing a blue marble?
a. 0.2
B. 0.3
C. 0.4
D. 0.5
37. It is the ratio between the water stored in the soil root zone during irrigation and
the water delivered to the farm expressed in percent.
a. Water Conveyance Efficiency
c. Water - use Efficiency
b. Water Application Efficiency
d. Water Storage Efficiency
38. It is the ratio between the water delivered to the farm and the water diverted from
a river or reservoir expressed in percent.
a. Water Conveyance Efficiency
c. Water - use Efficiency
b. Water Application Efficiency
d. Water Storage Efficiency
39. It is the ratio of water stored in the root zone during the irrigation to the water
needed in the root zone prior to irrigation, expressed in percent.
a. Water Conveyance Efficiency
c. Water - use Efficiency
b. Water Application Efficiency
d. Water Storage Efficiency
40. It is the ratio of water beneficially used on the project, farm or field to the amount
of water delivered to the farm expressed in percent.
a. Water Conveyance Efficiency
c. Water - use Efficiency
b. Water Application Efficiency
d. Water Storage Efficiency
41. It is the ratio of the normal consumptive use of water to the net amount of water
depleted from the root zone soil.
a. Consumptive Use Efficiency
c. Water - use Efficiency
b. Water Application Efficiency
d. Water Storage Efficiency
42. A field is divided into a series of strips by borders or ridges running down the
predominant slope or on the contour.
a. Ordinary flooding
c. Level border
b. Border-strip flooding
d. Contour ditch Irrigation
43. One term of Layout of a Tile -Drain System or Closed Drains that is used if the
entire area is to be drained and is usually more economic. Laterals enter the submain
from one side only to minimize the double drainage that occurs near the submain.
a. Natural System
b. Gridiron Layout
c. Herringbone Pattern
d. Double-main System
44. A fully penetrating well installed in a confined aquifer with a transmissivity of 197
m2/day is pumped at a constant rate. If the drawdowns in two observation wells 8 m
and 22 m from the pumped well were observed to be 1.42 m and 0.44 m, respectively,
the steady state pump discharge is
a. 220 gpm
b. 225 gpm
c. 230 gpm
d. 235 gpm
45. The velocities at 0.2 and 0.8 of the depth of flow in a parabolic open channel are
1.0 m/s and 0. 2 m/s, respectively. If the flow depth is 0.5 m and the top width is 1.5
m, the discharge is
a. 300 lps
b. 305 lps
c. 310 lps
d. 315 lps
46. Given the following direct runoff hydrograph in m3/s taken at 1-hr interval in the
mainstream of a 50 sq. km watershed: 0, 2.8, 13.8, 44.8, 77.8, 37.8, 12.8, 4.5, 1.8,
1.3, 0.9, 0.6, 0.2. The equivalent depth of direct runoff is
a. 14.3 mm
b. 15.3 mm
c. 16.3 mm
d. 17.3 mm
47. The critical depth in a rectangular channel with a bottom width of 4.0 m for a
discharge of 5 m3/s is
a. 0.504 m
b. 0.540 m
c. 5.40 m
d. 0.5004
48. Groundwater is to be pumped from a shallow aquifer for irrigation purposes. The
required discharge is 300 gpm. The suction head is 8 ft and the maximum drawdown is
10 ft. The friction and minor losses are 0.45 ft and 0.3 ft, respectively. If the pump
efficiency is 60%, the theoretical input power required is
a. 6.4 hp
b. 5.4 hp
c. 2.40 hp
1.4 hp
49. The soil has a field capacity of 22% and a permanent wilting point of 12 %, both on
a dry mass basis. The apparent specific gravity is 1.4. If the rootzone depth is 1.0 m
and the management allowable deficit is 50%, the net application depth is
a. 40 mm
b. 50 mm
c. 60 mm
d. 70 mm
50. The most hydraulically efficient trapezoidal channel section to carry a discharge of 5
m3/s on a bed material with a roughness n of 0.02 and a bottom slope of 1 in 800
should have a bottom width of
a. 4.65 m
b. 3.65 m
c. 2.65 m
d. 1.65 m
51. It is an advanced stage of rill erosion.
a. stream bank erosion
b. gully erosion
c. sheet erosion
d. Splash erosion
52. It is one of the vegetative measures that states the process of covering the land
surface with plant residues, plastic or other materials appropriate to arrest loss of
moisture through evaporation.
a. cropping systems
c. mulching
b. contour cultivation
d. strip cropping
53. It is a type of terrace that is used for 25-30% slopes.
a. Bench Terrace
c. Broad-based terrace
b. Zingg or Conservation bench terrace
d. ridge type terrace
54. It is a type of terrace that is used for 9-12% slope.
a. Zingg or Conservation bench terrace
c. ridge type terrace
b. Bench Terrace
d. Broad-based terrace
55. It is a type of flow that the fluid moves in parallel layers with no cross-currents;
Re<= 2000
a. laminar flow
c. steady flow
b. turbulent flow
d. uniform flow
56. The depth of flow is the same at every section of the prismatic channel.
a. laminar flow
c. steady flow
b. turbulent flow
d. uniform flow
57. It is a stuctured device designed to hold a pool of water to cushion the impact and
retard the flow of falling water as from an overflow weir, chute or drop.
a. staff gage
c. stilling Basin
b. river gage
d. drop stopper
58. The soil property which describes the ability of the soil to transmit water.
a. percolation rate
c. hydraulic conductivity
b. infiltration rate
d. seepage
59. It is the time required for water to flow from the most remote point of the
watershed
to the outlet.
a. time to peak
c. lag time
b. time of concentration
d. recession time
60. What do you mean by wifi?
a. wire fidelity internet
c. wireless fidelity internet
b. wireless fidelity
d. with internet for inside
61. What do you mean by http?
a. hypertext transfer process
c. high text transfer process
b. high text transfer protocol
d. hypertext transfer protocol
62. A hydraulic structure that serves as an outlet of water in irrigation canals whereby
water passes through and discharges into the main farm ditch of service area is called
a. checkgate
c. headgate
b. turnout
d. sipon
63. How do you classify a 260 kw hydro power plant?
a. microhydro
c. minihydro
b. small hydro
d. hydro
64. Using Philippine classification, specify the maximum power rating for microhydro?
a. 100 kw
b. 70 kw
c. 150 kw
d. 50 kw
65. What is the standard diameter of both vertical and horizontal reinforcing bars in
open channel construction?
a. 14 mm
b. 12 mm
c. 10 mm
d. 8 mm
66. How many 40-kg bags of cement are needed per cubic meter concrete in standard
(Class A) open channel construction?
a. 14
b. 11
c. 9
d. 7
67. Irrigation before final seedbed preparation and planting; a method to insure
adequate moisture for the germination of crop seeds.
a. Seed Irrigation
c. Pre-irrigation
b. Germigation
d. Seedbed Irrigation
68. Process by which water is lost from leaves of plants.
a. Perspiration
c. Transpiration
b. Germination
d. Evapotranspiration
69. Term used in soil that indicates the proportion of different sizes of soil particles.
a. soil mixture
c. soil texture
b. soil structure
d. soil proportion
70. Specific property of soil which is a measure of the readiness with which the soil
transmit water.
a. conductivity
c. permeability
b. resistivity
d. emissibity
71. The ratio of area wetted to perimeter.
a. Hydraulic Mean Radius
c. Hydraulic Gradient
b. Mean Radius
d. Hydraulic Conductivity
72. A device used to conduct water across a road.
a. turnout
c. drainage
b. canal
d. culvert
73. Structure that raises the water level in a canal or river.
a. flume
c. spillway
b. vision works
d. check/dam
74. A device placed across a stream or canal whose opening is used to measure
discharge of the canal.
a. weir/flume
c. chute
b. spillway
d. stilling basin
75. Determine the quantity of the filler needed to make up a metric ton of 10-10-15
fertilizer mixture using urea (45%N), and Ammonium Chloride (26%) in equal
quantities, calcined phosphate (30%P2O5) and sulphate of potash (50%K2O)
a. 46 kg
b. 64 kg
c. 60.4 kg
40. 6 kg
76-81. Given an eggplant plantation on a sandy loam soil:
ASSUMPTIONS:
Root zone depth of eggplant - 9 cm
Average evapotranspiration of Eggplant - 4.7 mm/day
Field Capacity of Sandy Loam Soil - 14%
Permanent Wilting Point of Sandy Soil - 6%
Readily Available Moisture - 60%
Apparent Specific Gravity - 1.5
76. Determine the total available moisture.
a. 5%
b. 6%
c. 7%
d. 8%
77. Determine the range.
a. 3.8%
b. 4.8%
c. 5.8%
d. 6.8%
78. Permanent wilting point of a soil or the moisture content.
a. 8. %
b. 9.2%
c. 10.2%
d. 11.2 %
79. What does the permanent wilting point imply?
a. It is the lowest level of moisture in the soil which the plant can tolerate.
b. Below this level could result to plant stress.
c. both a and b
d. none
80. Determine the Readily Available Moisture in depth.
a. 5.04 mm
b. 6.04 mm
c. 7.04 mm
d. 8.04 mm
81. Determine the number of days to which the plant will be stressed.
a. 1.23 days
b. 1.25 days
c. 1.26 days
d. 1.28 days
82. For continuos running test of LOKS, the sprayer shall be run continuosly for
a. 100 hours
b. 200 hours
c. 300 hours
d. 400 hours
83. A type of pump with impellers rotating inside a closed casing which draws water
into the pump through a central inlet opening and forces water out through a discharge
outlet at the periphery of the housing by means of centrifugal force.
a. Impeller pump
c. Axial flow pump
b. centrifugal pump
d. Submersible pump
84. Determine the maximum total head at which a 3.73 kw centrifugal pump can
extract water at a rate of 25 lps if pump efficiency is 65%.
a. 32.48 ft
b. 33.48 ft
c. 34.48 ft
d. 35.48 ft
85. Find the horsepower, if it desired to have a discharge of 9 lps and a head of 6 m.
a. 1.4 kw
b. 2.3 kw
c. 3.3 kw
d. 0.52 kw
86. Find the power input to a pump that requires a 25N-m torque at 2000 rpm.
a. 2.5 hp
b. 3.5 hp
c. 4.5 hp
d. 5.5 hp
87. A pump with an input power of 6Kw delivers 523.81 GPM at a head of 15 meter.
What is the efficiency of the pump?
a. 80%
b. 79%
c. 81%
d. 82%
88. If the angle of elevation of the sun is 42°, what is the length of the shadow on the
level ground of a man who is 6.1 ft tall?
a. 6.66 ft
7.77 ft
c. 8.88 ft
d. 9.99 ft
89. In frequency analysis, most hydrologic processes, more or less, follow this process.
This process is governed by chance and time dependent.
a. Probabilistic Process
c. Deterministic Process
b. Hydrolistic Process
d. Stochastic Process
90. According to International Soil Science Society (ISS), the diameter of silt is
a. 0.2-2 mm
b. 0.002-0.02
c. below O.002
d. none
91. According to United States Department of Agriculture (USDA), the diameter of silt is
a. below 0.002
b. 0.002-0.05
c. 0.10-0.25
d. 0.25-0.5
92. Determined by placing an air dry soil in a nearly saturated atmosphere at 25°C until
it absorbs no more water. This tension is equal to a force of 31 atm. Water at this
tension is not available to plants.
a. Wilting Percentage
c. Readily Available Moisture
b. Field Capacity
d. Hygroscopic coefficient
93. Station locations and amounts of rainfall are plotted on a suitable map, and
contours of equal precipitation (isohyets) are then drawn.
a. Arithmetic mean
c. Isohyetal
b. Thiessen Polygon
d. none
94. That part of surface runoff that flows over the surface towards the stream channel.
a. Overland flow
c. Subsurface runoff
b. Direct runoff
d. Baseflow
95. Time for surface and interflow to recede; duration of flooding.
a. Peak flow
c. Base time
b. Time to peak
d. Recession Time
96. What do you call the mountain, with reference to the wind direction, in which the
air mass passing through it is cold and dry.
a. Eastwest wind
c. Windward
b. Northsouth wind
d. Leeward
97. A type of cropping system wherein different crops are planted in an area one after
the other each season.
a. strip cropping
c. cropping pattern
b. mixed cropping
d. relay cropping
98.The rate of decrease of temperature with the increase in elevation is called.
a. lapse rate
c. Convection rate
b. updraft
d. Deflection rate
99. He is the current Secretary of Department of Agriculture.
a. Ferdinand M. Marcos Jr.
c. Ferdinand R. Marcos Jr.
b. Ferdinand J. Marcos Jr.
d. Ferdinand D. Marcos Jr.
100. Philippine Clean Water Act of 2004
a. RA9729
b. RA9275
c. RA9367
d. RA9513
Irrigation and Allied Subjects Answer key
1. b 21. b 41. a 61. d 81. d
2. c 22. c 42. b 62. b 82. b
3. b 23. a 43. b 63. c 83. b
4. a 24 a 44. a 64. a 84. a
5. a 25. a 45. a 65. c 85. d
6. d 26. b 46. a 66. c 86. d
7. b 27. a 47. b 67. c 87. a
8. c 28. c 48. c 68. c 88. a
9. b 29. b 49. d 69. c 89. d
10. b 30. d 50. d 70. c 90. b
11. c 31. b 51. b 71. a 91. b
12. d 32. b 52. c 72. d 92. d
13. d 33. b 53. a 73. d 93. c
14. d 34. a 54. a 74. a 94. a
15. a 35. a 55. a 75. b 95. d
16. b 36. a 56. d 76. d 96. d
17. c 37. b 57. c 77. b 97. d
18. d 38. a 58. c 78. b 98. a
19. a 39. d 59. b 79. c 99. b
20. c 40. c 60. b 80. b 100.b