Test
Text#2 SCSC301
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Preguntas del test (46)
1_____is comparatively soluble in soil solution and therefore easily weathered.
- AHematite
- BMica
- CApatite
- DGypsum
2Quartz _____.
- Aweathers to form clay minerals
- Bis a phosphorus bearing mineral
- Cis resistant to weathering
- Dis soluble in soil solution
3A pot of soil that is 30 cm tall and which has been wetted until excess water drips from the bottom will retain _____than the same volume of soil under normal field conditions.
- Awater more evenly distributed
- Bsame amount of water
- Cmore water near the bottom and less water near the top
- Dless water throughout
4At field capacity, the soil moisture tension in a granular silt loam surface soil overlying a layer of gravel will be _____.
- A0 bar throughout
- Bless than 1/3 bar (0.033 MPa)
- Cjust less than 0 bar throughout
- D1/3 bar (.03 MPa)
5Aeration in a soil with single grain structure is probably _____.
- Amoderate
- Bpoor
- Cgood
6Aeration in loamy and clayey soils is more closely associated with _____ than with the other properties.
- Aparticle density
- Bstructure
- Ctexture
- Dconsistence
7The chemical composition of minerals in a residual soil usually differs from that of the parent rock because the soil minerals contain a_____.
- Ahigher percentage of bases
- Bhigher percentage of silicon
- Clower percentage of Fe and Al.
- Dlower percentage of bases
8All of the following except _____ are among the four plant essential metallic elements found in largest amounts in rocks and soils.
- Aaluminum
- Biron
- Cpotassium
- Dcalcium
9The effect of a gravel layer in a soil is to cause the soil above the layer to hold _____than it would hold if the gravel layer was not present.
- Amore water at satiation
- Bmore water at field capacity
- Cmore water at the wilting point
- Dless water at field capacity
10Particles which have equivalent spherical diameters between 0.05 and 0.002 mm are called _____.
- Asilt
- Bloam
- Cclay
- Dsand
11Reactivity of materials in the weathering environment is a function primarily of _____.
- Asurface area
- Bparticle shape
- Csoil consistence
- Delevation
12_____ is an active soil forming factor.
- ABiota
- BRegolith
- CParent Material
- DTopography
13At the 30 cm depth in soils, the soil temperature changes _____ than at the soil surface.
- Aare more abrupt
- Bare more frequent
- Clag behind those near the surfaces
- Dare of greater magnitude
14In a uniform deep soil, water drains downward from the surface horizon due to differences in _____.
- Agravitational potential only
- Bcapillary potential only
- Cosmotic potential only
- Dgravitational and capillary potentials
15Heat is produced by addition of water to an oven-dry, fine textured soil because ____ as wetting of the soil occurs.
- Awater loses kinetic energy
- Bwater gains potential energy
- Cparticles gain potential energy
- Dwater loses soil moisture tension
16Water molecules most tightly absorbed to soil particles are held by _____.
- Acohesive forces
- Bgravitational forces
- Ccapillary forces
- Dadhesive forces
17_____weathers to form silicate clay minerals in soils.
- AQuartz
- BFeldspar
- CGypsum
- DHematite
18At a specified diffusion gradient, the rate of gas diffusion through a soil is largely a function of _____.
- Agravimetric water content
- Bair-filled porosity
- Ctotal soil porosity
- Dparticle density
19This component makes up the largest percentage of most moist soils on a volume basis.
- Aorganic matter
- Bair
- Cwater
- Dmineral matter
20The unsorted, ice transported and deposited material which composes ground moraines is called glacial_____.
- Aoutwash
- Baeolium
- Cloess
- Dtill
21A soil solum is composed of _____.
- AA horizon only
- BA and B horizons
- CB horizon
- DA, B, and C horizons
22_____is a metamorphic rock which formed due to pressuring and heating of shale.
- Aslate
- Bbasalt
- Cmarble
- Dgneiss
23Alluvium is _____.
- Awater transported and well sorted
- Bwater transported and poorly sorted
- Cwind transported and well sorted
- Dwind transported and poorly sorted
24A soil has a gravimetric water content of 0.25, a bulk density of 1.2 g/cm3 and 0.55 total porosity. Its air-filled porosity is _____.
- A0.15
- B0.20
- C0.25
- D0.30
25A sample of soil has a wet mass of 50 g, a dry mass of 42 g, a bulk volume of 30 cm3, and a particle density of 2.6 g/cm3. Its total porosity would be _____.
- A0.36
- B0.64
- C0.46
- D0.54
26To determine the bulk density of an undisturbed soil core of known volume, the only measurement required is _____ of the core.
- Awet mass
- Bmass of water
- Cparticle density
- Doven dry mass
27The mass per acre furrow slice for a soil with a bulk density of 1.2 g per cm3 when the acre furrow slice is considered to be 6 inches thick (water weights 62.4 pounds per cubic foot and an acre has 43,560 square feet; 1 inch = 2.54 cm and 1 pound = 454 g)
- A1,630,000 pounds
- B2,000,000 pounds
- C1,100,000 pounds
- D2,171,800 pounds
28_____describes the behavior of a soil in response to manipulation at a specified moisture content.
- AAggregation
- BConsistence
- CTexture
- DStructure
29Which one of the following soils will have the darkest color _____.
- A10YR 2/1
- B7.5 YR 5/2
- C5YR 6/8
- D2.5 YR 8/4
30A _____ is a splotch of one color in a matrix of different color in a soil
- Achroma
- Bmottle
- Cpatch
- Dhue
31_____ is not a word used in describing the consistence of soils.
- AStiff
- BPlastic
- CFriable
- DSticky
32Compaction of a soil brings about a decrease in ____.
- Atexture
- Bconsistence
- Csoil permeability
- Dparticle density
33Loess is a soil parent material that was transported by _____.
- Awind
- Bwater
- Cgravity
34The soil components arranged from poorest to best in heat conduction properties are _____.
- Aair-water-solids
- Bair-solids-water
- Csolids-water-air
- Dwater-solids-air
35_____ is the soil property most directly related to rate of soil warming in the spring.
- AMoisture content
- BSoil aeration
- CMineral type
- DSoil texture
36The textural classes occurring in a till derived soil having a A, B, C horizon sequence were loam, clay loam, and clay. The sequence of occurrence of these textural classes in the A, B, and C horizons, respectively, was probably _____.
- Aloam, clay loam, clay
- Bloam, clay, clay loam
- Cclay loam, clay, loam
- Dclay, loam, clay loam
37_____ is not a role of water in soils.
- AReaction medium
- BTransporting medium
- COxygen diffusion
- DTemperature buffer
38Water enters animal burrows which are plugged at the surface _____.
- Aas soon as the wetting front touches the burrow
- Bonly after the surrounding soil is saturated
- Cunder a gravitational potential gradient
- Dby capillary action
39The matric potential of water retained in a soil after drainage is _____ that of free water.
- Aless than
- Bgreater than
- Cthe same as
40When compared to atmospheric air, soil air is ____.
- Alower in CO2 and O2
- Bhigher in CO2 and O2
- Chigher in O2 and lower in CO2
- Dlower in O2 and higher in CO2
41Oxygen in soils is essential for _____.
- Arespiration by microorganisms
- Brespiration in plant roots
- Coxidation reactions
- Dthree of the above
42A soil horizon in which the supply of gases is adequate for optimum biological activity is said to _____.
- Abe well aerated
- Bbe oxygenated
- Cbe well diffused
- Dhave rapid mass flow
43The principal role of aggregation in making fine textured soils suitable for plant growth is to ____.
- Adecrease bulk density
- Bincrease total porosity
- Cincrease number and volume of large pores
- Ddecrease particle density
44The range in bulk density for mineral soils is about _____g/cm3.
- A1.2-1.6
- B0.5-2.5
- C1.0-3.5
- D0.7-1.7
45The structural size of a horizon having a moderate, medium, columnar structure is _____.
- Acolumnar
- Bmoderate medium
- Cmoderate, medium columnar
- Dmedium
46Aggregate formation involves flocculation and ____of primary particles into stable peds.
- Aformation
- Bcementation
- Csedimentation
- Dreorientation
Información
- Descripción
- Test sobre Text#2 SCSC301, creado por Dylan Buysse el 08/06/2015.
- Autor
- Dylan Buysse
- Idioma
- English
- Visitas
- 1
- Valoración
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