EXAM 1

Question 1

Ratio of the dry weight of soil particles to the weight of an equal volume
of water
a. Particle Density
b. Bulk Density
c. Real specific Density
d. Apparent specific density

Question 2

For rolling areas and non-uniform distribution of gages, distance factor
fixed by location of gages is used for analysis using this method.
a. Inverse Distance Ratio Method
b. Grid-Point Method
c. Isohyetal
d. Thiessen polygon

Question 3

Which among the elements is a major element for plant nutrition?
a. Boron
b. Chlorine
c. Nitrogen
d. Silicon

Question 4

The process of converting water and carbon dioxide into sugar using
chlorophyll and light energy accompanied by the production of oxygen by green
plants:
a. respiration
b. oxidation
c. transpiration
d. photosynthesis

Question 5

Total water yield from a storm for a given watershed
a. Surface runoff
b. Subsurface runoff
c. Groundwater runoff
d. Runoff volume

Question 6

This resembles terracing in that the drainage ditches are constructed
around the slope on a uniform grade according to the land topography.

a. Random ditch system
b. Double-main system
c. Interception or cross-slope system
d. Diversion or parallel ditch system…

Question 7

It is the soil moisture allowable depletion of most crops.
a. 50%
b. 20%
c. 80%
d. 100%

Question 7

Wherein the surface is rarely wet since the water is supplied from the
soil underneath
a. Sprinkler irrigation
b. Sub-irrigation
c. Drip or trickle irrigation
d. Contour-ditch irrigation

Question 8

An internal condition of a seed or bud that prevents its prompt germinating
or sprouting under normal growth conditions:
a. dormancy
b. diffusion
c. germination
d. dominant

Question 9

A natural body composed of a variable mixture of broken and weathered
minerals and decaying organic matter and when containing the proper amount of
air and water, supplies sustenance and gives mechanical support of plants:
a. fertilizer
b. soil
c. humus
d. mineral

Question 9

The process of moisture lost of plants through the leaves:
a. germination
b. transpiration
c. oxidation
d. flowering

Question 9

Similar to that of tertiary canals, the main systems (main and secondary canals) also incur losses termed as conveyance losses. Seepage and percolation losses and evaporation along the conveyance canals comprise the conveyance losses.

a. Diversion Water Requirement (DWR)
b. Farm Water Requirement (FWR)
c. Irrigation Water Requirement (IWR)
d. Crop Water Requirement (CWR)

Question 10

It involves controlled flooding from field ditches along the contour of
the land, which allows the water to flood down the slope between field
ditches without employing dikes or other means that guide or restrict its
movement.
a. Sprinkler irrigation
b. Sub-irrigation
c. Level-border or basin irrigation
d. Contour-ditch irrigation

Question 11

The common name for Capra hircus:
a. sheep
b. pig
c. mule
d. goat

Question 12

The ability of the stream to provide water determines the extent of the total service area of a national irrigation system
a. Secondary canal
b. Main canal
c. Canal
d. Canal capacity

Question 13

Includes evaporation and transpiration, lumped together as
evapotranspiration.
a. Irrigation water requirement (IWR)
b. Consumptive
c. Non-consumtive
d. Crop water requirement (CWR)

Question 14

The common name for Anser domesticus:
a. chicken
b. goose
c. duck
d. turkey

Question 15

The ratio of the weight of water to the dry weight of the soil
a. Soil Texture
b. Soil Structure
c. Porosity
d. dry weight basis

Question 16

Advanced stage of rill erosion. Rills when neglected develop in size and
become gullies.
a. Slip erosions
b. Wind erosions
c. Stream bank erosion
d. Gully erosion

Question 17

Used for flood forecasting and water quality studies; watershed response
time
a. Surface time
b. Time to peak
c. Recession time
d. Peak recession time

Question 18

This is suitable on flat, poorly drained soils that have numerous shallow
depresssions.
a. Random ditch system
b. Double-main system
c. Interception or cross-slope system
d. Diversion or parallel ditch system

Question 19

Water is supplied to level plots surrounded by dikes or levees. This
method is particularly useful on fine-textured soils with low permeability,
it is necessary to hold the water on the surface to secure adequate
penetration.
a. Sprinkler irrigation
b. Sub-irrigation
c. Level-border or basin irrigation
d. Contour-ditch irrigation

Question 20

The most efficient trapezoidal cross section.
a. width of the bottom= twice the depth
b. depth = twice the bottom width
c. width of the bottom = 4x the depth
d. width of the top=2x the sum of sides

Question 21

Removal of water from the road area by the use of culverts, ditches,
channels and other several structures
a. Crushed Gravel
b. Roadway Embankment
c. Course
d. Drainage

Question 22

The fraction of the irrigation water that must be leached through the root zone to control soil salinity at specified level. a. Leaching Requirement (LR) b. Farm Water Requirement (FWR) c. Irrigation Water Requirement (IWR) d. Crop Water Requirement (CWR)

Question 23

Water horsepower divided by pump efficiency, in decimal. a. Stochastic process b. Water horsepower c. Brake horsepower d. Barrow process

Question 24

This involves the averaging arithmetically all the rainfall depths measured by the rain gages within the area a. Inverse Distance Ratio Method b. Grid-Point Method c. Thiessen polygon d. Arithmetic mean

Question 25

Any open or close ground or surface for the passage of water. a. Water way b. Seepage c. Percolation d. Watershed

Question 26

Combination of sheet and splash erosion a. Interrill erosion b. Rill erosion c. Gully erosion d. Stream channel erosion

Question 27

Caused by high velocity winds moving over barren land surfaces. a. Slip erosions b. Wind erosions c. Coastal erosions d. Stream bank erosion

Question 28

Soil productivity is the ability of the soil a. to produce the desired amount of plant yield b. supply nutrients in sufficient and balanced amounts c. store and resist leaching nutrients d. all of the above

Question 29

The percent N, P2O5 and K2O in a fertilizer a. fertilizer grade b. fertilizer ratio c. fertilizer recommendation d. none of the above

Question 30

Primarily caused by raindrop a. Slip erosions b. Wind erosions c. Coastal erosions d. Splash/Raindrop erosion

Question 30

Which is not a single-element or straight fertilizer? a. Urea b. Muriate of Potash c. Ammonium phosphate d. Ammonium sulfate

Question 31

Surface runoff plus interflow a. Base flow b. Direct runoff c. Groundwater runoff d. Peak flow

Question 32

The soil type largely influences the width of bed to be used. The furrows drain to collection ditches. a. Random ditch system b. Double-main system c. Bedding system d. Natural system

Question 33

The scientific name for pigeon: a. Columbia livia b. Anser domesticus c. Gallus gallus d. Numida meleagris

Question 34

The needed for water to infiltrate into the soil, depending on the depth of water and the soil. a. Infiltration rate b. Infiltration c. Infiltration efficiency d. None of the above

Question 35

Irrigation systems that have relatively large service areas and are managed by government agencies a. Shallow Tubewell Irrigation Systems (STW) b. On-Farm Irrigation Facilities c. Communal Irrigation Systems (CIS) d. National Irrigation Systems (NIS)

Question 38

The soil moisture content when plants permanently wilt. The soil moisture tension at this point is about 15 atmospheres. Permanent wilting percentage can be estimated by dividing the field capacity by a factor ranging from 2.0 top 2.4, with the value higher for soils with higher silt content. a. Computation of moisture content b. Readily available moisture (RAM) c. Available moisture (AM) d. Permanent wilting point (or wilting coefficient)

Question 39

Type of flow wherein the depth of flow in a prismatic channel is constant at any point in the channel a. laminar flow b. uniform flow c. steady flow d. critical flow

Question 40

Urea is one of the many form of commercial fertilizers with a typical grade of ______? a. 14-14-14 b. d. 0-0-60 c. 45-0-0 d. 0-30-0

Question 41

The study of soil which puts more emphasis on the origin, characteristics, classification and description: a. Pedology b. Botany c. Pathology d. Agronomy

Question 42

The unit of heredity, variation, sex determination and related phenomena: a. plasma b. protein c. gene d. cell

Question 43

Lands serviced by natural irrigation or irrigation facilities. These include land where water is not readily available as existing irrigation facilities need rehabilitation or upgrading or where irrigation water is not available year-round a. Irrigators’ Association b. Irrigation System c. Irrigated Lands d. Irrigable Lands

Question 44

This property of run-off is used for flood forecasting and water quality analysis. It is the time where the flood flow is highest. a. Recession time b. Time to lag c. Run-off time d. Time to peak

Question 45

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

Question 46

A type of terrace usually used for 9-24% slope characterized by breaking the slope at certain intervals by a ridge and a flat portion to trap runoff. a. Bench terrace b. Zingg terrace c. Broad-based terrace d. Manning’s terrace

Question 47

The ratio of the void volume to the total soil volume (unitless) a. Soil Texture b. Soil Structure c. Porosity d. dry weight basis

Question 48

Ratio of the bulk density of the soil with the density of water; it is the ratio of the weight of soil to the weight of water with volume equal to the total soil volume a. Bulk density b. Particle density c. Apparent specific gravity d. Real specific gravity

Question 49

Include seepage and percolation losses. a. Irrigation water requirement (IWR) b. Consumptive c. Non-consumtive d. Crop water requirement (CWR)