EXAM 3

Question 1

Vulnerability or susceptibility of the soil to erosion. It is a function
of both the physical properties of the soil and land management practices.
a. Erodibility
b. Erosivity
c. Susceptibility
d. Vulnerability

Question 2

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
b. Contour cultivation
c. Mulching
d. Strip cropping

Question 3

It is the simplest piece of overhead irrigation equipment and is commonly
used in small-scale upland farming.
a. Hose pipe
b. Watering can
c. Drainage
d. Overhead irrigation

Question 4

An imaginary line of constant elevation on the surface of the ground.
a. Horizontal interval
b. Vertical Interval
c. Contour map
d. Contour line

Question 5

The ratio of the volume of water to the total soil volume
a. Soil Texture
b. Volume basis or volumetric MC
c. Porosity
d. dry weight basis

Question 6

The Scientific name for onion:
a. Raphanus sativus
b. Daucus carota
c. Allium sativum
d. Allium sepa

Question 7

A major irrigation system managed by the national irrigation
administration
a. Communal irrigation system
b. Secondary canal
c. Main canal
d. National irrigation system

Question 8

Expresses the relationship between speed in rpm, discharge in gpm, and
head in feet.
a. Static head
b. Specific speed
c. Drawdown
d. Characteristic curve

Question 9

Provide record of the highest stage observed at a stream
a. Float method
b. Float type water stage recorder
c. Bubbler gage
d. Crest stage gage

Question 10

An association of farmers within a contiguous area served by a national
irrigation system or communal irrigation system
a. Irrigators’ Association
b. Irrigation System
c. Irrigated Lands
d. Irrigable Lands

Question 11

The ratio between the water delivered to the farm and the water diverted
from a river or reservoir expressed in percent
a. Water storage efficiency
b. Water-use efficiency
c. Water application efficiency
d. Water conveyance efficiency

Question 12

Consists of carrying out agricultural operations very nearly on the
contour. It reduces the velocity of overland flow and retards soil erosion
a. Cropping systems
b. Contour cultivation
c. Mulching
d. Strip cropping

Question 13

Is a graphical representation of the instantaneous runoff rate against
time. The area under the hydrograph gives the runoff volume
a. Hydrograph
b. Pearson hydrograph
c. Log-Normal Distribution hydrograph
d. Normal hydrograph

Question 14

One liter per second is equal to
a. 16.85 gpm
b. 15.5 gpm
c. 15.85 gpm
d. 17.35 gpm

Question 15

An irrigation system that is managed by a bonafide irrigators’
association
a. Headworks
b. Communal irrigation system
c. Shallow tubewell
d. National irrigation system

Question 16

Record the pressure required to maintain a small flow of gas from an
orifice submerged in the stream
a. Float method
b. Float type water stage recorder
c. Bubbler gage
d. Crest stage gage

Question 17

Planting different crops simultaneously in the same field at the same
cropping season.
a. Graded terrace
b. Relay cropping
c. Multi cropping or mixed cropping
d. Strip cropping

Question 18

Discharge is not constant with respect to time
a. Spatially variable flow
b. Turbulent flow
c. Laminar flow
d. Unsteady flow

Question 19

The lateral flow of liquid through porous media; the lost of water from
irrigation canals.
a. Soil conservation
b. Seepage
c. Percolation
d. Watershed

Question 20

A term adapted to measures utilizing both or in combination with the
biological and engineering measures.
a. Culvert
b. Vengineering
c. Drop structures
d. Flume

Question 21

Establishment of natural waterways or construction of canals and planting
it with grasses to make it stable and arrest soil erosion
a. Riprap
b. Grassed waterways
c. Check dams or weirs
d. Farm Ponds / Water Impounding Dams

Question 22

Landslides and slips due to saturation of steep hills and slopes.
a. Slip erosions
b. Wind erosions
c. Coastal erosions
d. Stream bank erosion

Question 23

The scientific name for sheep:
a. Capra hircus
b. Sus domesticus
c. Bubalus Bubalis
d. Ovis aries

Question 24

Moisture content present in the soil when gravitational water
removed is called:
a. wilting point
c. unavailable moisture
b. field capacity
d. nota

Question 25

75% of available moisture is called: a. readily available moisture b. hygroscopic water c. permanent wilting point d. nota

Question 26

The water right based on the concept first time, first in right: a. Right of way c. General Appropriation b. Appropriation Act d. nota

Question 27

The volume of water that can be stored in or released from an aquifer per unit horizontal area per unit change in hydraulic head is a. specific storage b. specific yield c. storage coefficient d. transmissivity

Question 28

The discharge through a 90 v-notch weir may be computed by: a. Q = 0.0184LH3/2 b. Q = 0.0184(L-.2H)3/2 c. Q = 0.0186LH3/2 d. Q = 0.0138H5/2

Question 29

53. The lateral movement of water in the soil: a. seepage c. irrigation b. drainage d. flooding

Question 30

Development of deep well by compressed air is best suited for ___wells. a. big b. small* c. open d. nota

Question 31

The mass per unit volume of the soil particles is: a. specific gravity b. porosity c. soil density d. void ratio

Question 32

The ratio of the volume of pores to the volume of solid is: a. void ratio b. porosity c. specific gravity d. soil density

Question 33

Water held by forces of surface tension and continuous films around the soil particles is: a. capillary water b. hygroscopic water c. gravitational water d. soil water

Question 34

Water held tightly to the surface of soil particle by adsorption forces is: a. capillary water b. hygroscopic water c. soil water d. gravitational water

Question 35

It is the sheet of water which overflows a weir: a. Napped b. weir pond c. weir crest d. weir gauge

Question 36

An appurtenance to the pipeline which permits the passage of air to or from the pipeline. a. surge b. water hammer c. vent d. gate

Question 36

Sprinkler type with operating pressure from 20-40 psi: a. high pressure b. low pressure c. medium pressure d. nota

Question 37

The type of erosion that takes place in small channels which cannot be obliterated by tillage operations is called a. sheet b. rill c. interrill d. gully

Question 38

It is the combined process of evaporation and transpiration from plants. a. evaporation c. evapo-transpiration b. transpiration d. condensation

Question 39

Barrier constructed to hold water back and raise its level. a. channel b. dam c. well d. weir

Question 40

The volume of water flowing each second, measured in m3/sec. a. stream c. velocity b. discharge d. cross-sectional area

Question 41

Term for solar radiation received at the earth’s surface a. insolation b. illuminance c. radiation d. reflectiion

Question 42

The channel connected to the main canal which distributes irrigation to specific areas a. Headworks b. Communal irrigation system c. Shallow tubewell d. Secondary canal

Question 43

The minimum distance from the center of the lone pumped well wherein no drawdown will be observed is the __________________. a. well radius b. radius of interference c. radius of influence d. drawdown curve

Question 44

A 27 mm/day water requirement is equivalent to a. 29.75 gpm/ha b. 1.125 lps/ha c. 3.125 lps/ha d. 17.875 gpm/ha

Question 45

Planting different crops simultaneously in the same field at the same cropping season. a. Mixed/multiple cropping b. Relay cropping c. Inter cropping d. Strip cropping

Question 46

Vigna radiata is commonly known as: a. mungbean b. castor bean c. rice bean d. peanut

Question 46

On the weather map, lines representing points of equal pressure is called. a. Isohyets b. Contour lines c. Isobars d. None of the above

Question 47

For the most efficient trapezoidal cross-section: a. width of the bottom=1.5 of the depth b. width of the top=sum of sides c. width of the bottom=twice the depth d. width of the to=1/2 the sum of sides

Question 47

A conveyance structure used to turn conduits of varying sizes and shapes. a. cut off c. weir b. transition d. chute

Question 48

Surface irrigation method where a much smaller area is enclosed by levees. a. trickle irrigation c. basin flooding b. drip irrigation d. flood routing

Question 49

That part of surface runoff that flows over the surface towards the stream channel a. Base flow b. Direct runoff c. Overland flow d. Peak flow

Question 50

Erosion of stream banks by flowing water. a. Slip erosions b. Wind erosions c. Coastal erosions d. Stream bank erosion

Question 51

A vertical section to the soil mass where significant changes in the soil texture and structure with depth are observed a. Soil profile b. Soil structure c. Soil texture d. Soil taxonomy

Question 52

The moisture content of the soil when tension is 1/3 atmosphere. a. Field capacity b. Saturation point c. Wilting point d. None of the above

Question 53

This refer to the additional height or depth of hydraulic structures a. Flash board b. Free board c. Jump height d. Critical dept

Question 54

The rational method of determining runoff is applicable to. a. Small watershed b. Large watershed c. Watershed with good vegetation d. All watershed