AREA 2 U

Question 1

It is the ratio of the dry weight of
soil particles to the weight of an
equal volume of water

Answer 1

Real specific gravity
True specific gravity is the ratio of unit weight of soil solids to that of water.

Question 2

It is the ratio of the dry mass of the
soil to the mass of water with volume
equal to the soil bulk volume.

Answer 2

Apparent specific gravity
Apparent specific gravity is the ratio of the weight of a material to the weight
of an equal volume of water at a specified temperature

Question 3

It is the ratio of the volume of voids
to the total volume of the soil

Answer 3

Porosity

Question 4

The moisture content of the soil when
the gravitational water has been
removed?

Answer 4

Field capacity

Question 5

It is the soil moisture allowable
depletion of most crops?

Answer 5

50 %

Question 6

Which among the elements is a major
element for plant nutrition?
a. Boron
c. Nitrogen
e. None of the above
b. Chlorine
d. Silicon

Answer 6

c. Nitrogen

Question 7

The equation used in current meters is
V = a + bN. What does “a” signifies?
a. Proportionality
constant
c. Starting velocity
e. None of the above
b. Bed slope
d. Number of revolutions
per second

Answer 7

c. Starting velocity

Question 8

A type of terrace usually used for 25-30%
slope characterized by the construction of
series of platforms along the contours cut
into hill slope in a step like formation
a. Bench Terrace
b. Zingg Terrace
c. Broad-based Terrace d. Manning’s Terrace
e. None of the above

Answer 8

a. Bench Terrace

Question 9

Find the 6th term in the expansion of
(a-e)9
a. 1512 a3 e6
c. 1215 a2 e6
e. None of the above
b. 1512 a2 e5
d. 1251 a3 e6

Answer 9

b. 1512 a2 e5

Question 10

Is an advanced stage of rill erosion
where surface channels have eroded to
the point where they can not be removed
by tillage operations
a. Slip erosion
c. Stream bank erosion
e. None of the above
b. Wind erosion
d. Gully erosion

Answer 10

d. Gully erosion

Question 11

The gross application depth is 93 mm to irrigate a crop with a crop coefficient of 0.9. The reference crop evapotranspiration is 6mm/day. If the efficiency is 70%, the irrigation interval is?
a. 10 days
c. 12 days
e. None of the above
b. 11 days
d. 13 days

Answer 11

c. 12 days

Question 12

When the water level in the pipe drops
below the upper edge of the pipe or
culvert, the flow becomes?
a. Weir flow
c. Orifice flow
e. None of the above
b. Open Channel flow
d. Pipe flow

Answer 12

b. Open Channel flow

Question 13

A discharge of 20 lps is equivalent to?
a. 2 m3/hr
c. 0.02 li/min
e. None of the above
b. 20,000 m3/hr
d. 72 m3/hr

Answer 13

d. 72 m3/hr

Question 14

The ____ is the amount of water to be
applied to the field as irrigation.
a.Diversion Water Requirement (DWR)
b.Farm Water Requirement (FWR)
c. Irrigation Water Requirement (IWR)
d. Crop Water Requirement (CWR)
e. None of the above

Answer 14

c. Irrigation Water Requirement (IWR)

Question 15

A horizontal fully flowing 4 in pipe is
discharging water. The x and y coordinate of the water trajectory is measured from the end of the pipe are 1.5 m and 0.8 m,
respectively. Assuming that the coefficient
of discharge is 1.0, what is the discharge
of the pipe?
a. 10 lps
c. 30 lps
e. None of the above
b. 20 lps
d. 40 lps

Answer 15

c. 30 lps
Q=0.0174D^2X/Y^1/2

Question 16

Water held by forces of surface tension
and continuous films around the soil
particles is
a. Capillary Water
c. Soil water
e. None of the above
b. Gravitational water
d. Hygroscopic water

Answer 16

a. Capillary Water

Question 16

The lateral flow of liquid through
porous media; the loss of water from
irrigation canals
a.Infiltration
c. Percolation
e. None of the above
b. Seepage
d. Evapotranspiration

Answer 16

b. Seepage

Question 17

The features of a topographic map which
shows the low area between two adjacent
hills.
a. Mound
b. Valley
c. River
e. None of the above
d. Depression

Answer 17

b. Valley

Question 17

When contour line from a closed figure
with the highest elevation in the
center, the topographic map indicates
a. Mound
c. River
e. None of the above
b. Valley
d. Depression

Answer 17

a. Mound

Question 17

For an 8m x 8m sprinkler spacing, what
is the design sprinkler throw for a 40%
overlap?
a. 3.2m
c. 5.6m
e. None of the above
b. 6.4m
d. 10m

Answer 17

c. 5.6m

Question 18

The features of a topographic map which
is the line connecting the lowest
elevations between two adjacent ridges
a. Mound
c. River
e. None of the above
b. Valley
d. Depression

Answer 18

c. River

Question 19

When contour line from a closed figure
with the lowest elevation in the
center, the topographic map indicates
a. Mound
c. River
e. None of the above
b. Valley
d. Depression

Answer 19

d. Depression

Question 20

A topographically delineated area which
drains into a reference point in
the stream.
a. Streams
c. Ridge
e. None of the above
b. Mountains
d. watershed

Answer 20

d. watershed

Question 21

Farm turnout requirements plus conveyance losses in the main canal and lateral up to the farm turnout.
a.Diversion Water Requirement (DWR)
b.Farm Water Requirement (FWR)
c. Irrigation Water Requirement (IWR)
d. Crop Water Requirement (CWR)
e. None of the above

Answer 21

a.Diversion Water Requirement (DWR)

Question 22

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 b. Water storage efficiency c. Water-use efficiency d. Water application efficiency e. None of the abov

Answer 22

d. Water application efficiency

Question 22

A supercritical flow is a flow condition where: a. Fr=1 b. Fr>1 c. Fr<1 e. None of the above d. Fr>400

Answer 22

b. Fr>1 Fr=1 Critical depth Fr<1 Subcritical

Question 22

The sum of irrigation requirement and farm ditch losses. a.Diversion Water Requirement (DWR) b.Farm Water Requirement (FWR) c. Irrigation Water Requirement (IWR) d. Crop Water Requirement (CWR) e. None of the above

Answer 22

b.Farm Water Requirement (FWR)

Question 23

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. Consumptive use efficiency b. Water storage efficiency c. Water-use efficiency d. Water application efficiency e. None of the above

Answer 23

c. Water-use efficiency

Question 24

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 b. Water storage efficiency c. Water-use efficiency d. Water application efficiency e. None of the above

Answer 24

a. Water conveyance efficiency

Question 25

A command used for creating or making smooth/round edges or corners a. Chamfer c. Fillet e. None of the above b. Extrude d. Offset

Answer 25

c. Fillet

Question 26

The difference in elevation of the water surface in a pond, lake, or river from which pumped water is taken, and the water surface of the discharge canal into which the water flows from a submerged discharged pipe or the difference in elevation between the water surface in the well and the water surface of the discharged canal. a. Static head c. Drawdown e. None of the above b. Total dynamic head d. Net discharge head

Answer 26

a. Static head

Question 27

i5 + i4 + i3 =_____ a. -1 c. -i e. None of the above b. i d. 1

Answer 27

d. 1 Note: (i2 ) = -1

Question 27

The sum of total head above the vapor pressure of the liquid being pumped at a given pumping temperature. a. Static head c. Drawdown e. None of the above b. Total dynamic head d. Net discharge head

Answer 27

b. Total dynamic head

Question 28

Based on the sample data: 1, 5, 2, 4, 6, 6, the estimate of the sample variance is _____. a. 5.0 c. 4.4 b. 0.8 d. 2.1 e. None of the above

Answer 28

c. 4.4

Question 29

The recommended variation in the lateral between the first and last sprinkle. a. 50% c. 40% e. None of the above b. 30% d. 20%

Answer 29

d. 20%

Question 29

Based on the sample data: 1, 5, 2, 4, 6, 6, the estimate of the sample standard deviation is _____. a. 5.0 c. 4.4 e. None of the above b. 0.8 d. 2.1

Answer 29

d. 2.1

Question 29

Small water impounding management (SWIM) projects, in general, are those small-scale water impounding dams which have structural heights of not more than ____ a. 45m c. 30m e. None of the above b. 50m d. 100m

Answer 29

c. 30m

Question 30

The recent monsoon rains have posted a nearly uniform rainfall intensity of 30 mm/hr over a 1,500 ha watershed area in Central Luzon. If the runoff coefficient is 0.15, what is the runoff in cu.m/s? a. 18.75 c. 1.87 b. 187.5 d. 1.875 e. None of the above

Answer 30

a. 18.75 Rational method; Q=CiA C = runoff coeff i = rainfall intensity A = area

Question 31

A card is drawn from a pack of cards. Find the probability that the card will be queen or a heart. a. 4/3 c. 4/13 e. None of the above b. 16/3 d. 5/3

Answer 31

c. 4/13 P(Q) = 4/52 P(H) = 13/52 P(Q^H) = 1/52 P(Q U H) = P(Q) + P(H) – P(Q^H)

Question 32

What is the most abundant microorganism found in the soil? a. Protozoa c. Bacteria e. None of the above b. Molds d.Fungi

Answer 32

c. Bacteria

Question 33

The maximum value of nematodes in treated wastewater for purposes of irrigation and other agricultural uses. a. <200 MPN/100ml c. <100 MPN/100ml e. None of the above b. <50 MPN/100ml d. 0 MPN/100ml

Answer 33

d. 0 MPN/100ml PAES 232:2017 Water Re-use for irrigation

Question 33

If the area of flow using the most efficient rectangular cross-section is 8 ft2, find the depth of flow. a. 4 ft c. 2 ft e. None of the above b. 2.83 ft d. 1.78 ft

Answer 33

c. 2 ft Formula; Area= 2y2 =by y=b/2

Question 34

Find the depth of a trapezoidal open channel to carry 300 cfs assuming a bottom width of 4.5 ft, a slope of 0.08%, a side slope of 2:1, a freeboard of 20%, and a clean, straight channel with no rifts (n=0.03). a. 3.0 ft c. 5.0 ft e. None of the above b. 4.0 ft d. 6.0 ft

Answer 34

d. 6.0 ft Note slope of 80%, 7.13*80%=5.7ft (round up to 6ft) Q=AV (manning’s)

Question 35

A rod taken in known elevation a. Backsight c. Benchmark e. None of the above b. Foresight d. Turning Point

Answer 35

a. Backsight

Question 36

The elevation of the line of sight of the telescope when the instrument is leveled. a. Backsight c. Height of instrument e. None of the above b. Foresight d. Turning Point

Answer 36

c. Height of instrument

Question 37

What is the present moisture content of a soil with 25% of its AM has been used of its FC is 24% and PWP is 16% by weight? a. 21% b. 22% c. 23% e. None of the above d. 24%

Answer 37

b. 22% MC = FC - %AM used x (FC-PWP) = 0.24-0.25 x (0.24-0.16) = 0.22 or 22%