Test
Test#1 SCSC301
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Preguntas del test (46)
1A typical moist surface soil contains approximately 50% by volume ____________ .
- AMineral Matter
- BOrganic Matter
- CAir
- DOxygen
- ESecondary Minerals
2A common primary silicate mineral which weathers to form secondary silicate minerals in soils.
- Aapatite
- Bquartz
- Ccalcite
- Dmica
- Ehematite
3A primary silicate mineral that dominates in the sand and silt fraction of most soils is:
- Ahematite
- Bapatite
- Cmica
- Dquartz
- Edolomite
4One of the most soluble and therefore, easily weathered minerals is:
- Ahalite
- Bgypsum
- Capatite
- Dclay minerals
5A property used in distinguishing among minerals in hand held specimens is:
- Aslippage
- Bcleavage
- Cconsistence
- Dlessivage
6The properties of soil are due to the combined effects of _____________ acting on parent material over time.
- Aweathering and time
- Bclimate and biota
- Ctopography and drainage
- Dtopography and slope
7Soils which support aerobic plant growth must contain:
- Agaseous nitrogen
- Bgaseous oxygen
- Crocks
- Delemental carbon
8The soil horizons that the soil solum consist of are:
- AO,A,E,B
- BO,A, B, R
- CO,A,E,B,C
- DA.
9In the following question, list the appropriate letter for each part of the question in the order of occurrence in the statement.
-Surface soils are (a) more, (b) same, (c) less porous: (a) more, (b) same, (c) less dense and commonly of (a) coarser, (b) finer, texture than subsoils.- AA, C, A
- BC,C,A
- CA, B, B
- DC,A,B
10The passive soil forming factor is:
- Atime
- Bclimate
- Cweathering
- Dbiota
11The four most abundant metallic elements in most soils and rocks that are essential for ALL plants are:
- ACa, Mg, K, and S
- BCa, Mg, K, and Fe
- CCa, Mg, Al, and Fe
- DCa, Mg, Si, and Fe
12A soil typically contains a higher percentage of __________ than a rock which the soil is derived from.
- ACalcium
- BAluminum
- CPhosphorus
- DSilicon
13The parent material transported by wind is:
- Aloess
- Balluvium
- Ccolluvium
- Dglacial till
14An example of a sedimentary rock and its corresponding (similar in composition) metamorphic rock is:
- Ashale and slate
- Blimestone and marl
- Cgneiss and granite
- Dsandstone and siltstone
15An unsorted, transported parent material is:
- Aglacial outwash
- Bcolluvium
- Cloess
- Dalluvium
16The reactivity of materials in the soil weathering environment is a function primarily of:
- Abulk density
- Bsurface area
- Cparticle density
- Dsoil structure
17The combination of primary particles into secondary particles is:
- Aaggregation
- Bconsistence
- Ctexture
- Dstructure
18A major assumption made in applying Stoke's law to sedimentation of soil particles in a cylinder is:
- Aall particles will flocculate
- Bparticles will separated based upon density
- Call particles are the same size
- Dthe viscosity of the water remains the same
19A soil having A, B, and C horizons and a textural profile has horizons which are loam (l), clay loam (cl), and clay (c). The order of occurrence of these materials in the A, B, and C horizons would be:
- Al, cl, c
- Bl, c, cl
- Ccl, c , l
- Dc, l, cl
20Soil aggregation is more related to the content of:
- Asand and silt
- Borganic matter and clay
- Csilt
- Dwater and air
21The probable sequence of dominate aggregate types from the surface down in a soil having A, B, and C horizons would be:
- Agranular, subangular blocky, massive
- Bmassive, granular, subangular blocky
- Cmassive, subangular blocky, granular
- Dsubangular blocky, granular, massive
22The structure of a soil horizon is moderate, medium, granular. The structural size of the horizon is:
- Amedium
- Bmoderate
- Cgranular
- Dmoderate, medium
23To determine the bulk density of an undisturbed soil core, one must know its total volume and :
- Aparticle volume
- Boven-dry mass
- Cpore volume
- Dwet mass
24A sample of soil has a wet mass of 50g, a dry mass of 42g, a bulk volume of 30 cm3, and a particle density of 2.6g/cm3. Calculate the total porosity of the soil.
- A0.50
- B0.46
- C0.19
- D1.30
25A soil has a bulk density of 1.3g/cm3, a particle density of 2.6g/cm3, a total porosity of 0.50, and a gravimetric water content of 0.20. Calculate the water-filled porosity.
- A0.24
- B0.26
- C0.50
- D1.30
26The range in particle density in g/cm3 for mineral soils is about:
- A2.4-2.9
- B2.6-2.7
- C1.2-1.6
- D0.8-1.2
27From a biological point of view, the most important role of structural development in fine textured soils is to provide an increase in:
- Atotal porosity
- Bmacro porosity
- Ctexture
- Dparticle density
28After a growing season of heavy tillage traffic across a soil, a soil property that is affected is:
- Aparticle density
- Bbulk density
- Ctexture
- Dcolor
29A word used to describe the consistence of a soil is:
- Arigid
- Bfirm
- Cloam
- Dsmooth
30The purity of light reflected by a soil is called:
- Ahue
- Bchroma
- Cshade
- Dvalue
31In a soil, having a color of 10YR 4/1, the hue is:
- A10YR
- B10YR 4/1
- C4
- DYR
32Calculate the mass of one hectare of soil in kilograms to 15cm depth. (1 ha = 10,000m2, density of water 1000 kg/m3 = 1g/cm3, soil bulk density 1.5g/cm3).
- A2,250,000
- B2,250,000,000
- C2,038,608
- D1,500,000
33A principle role of oxygen in soils is:
- Aoxidation of iron
- Bphotosynthesis
- Cstabilization of organic matter
- Dcarbonation
34At a given partial pressure gradient, diffusion is a function of:
- Atotal porosity
- Bair-filled porosity
- Cparticle density
- Dconsistence
35Under normal aerated conditions, soil air compared to the atmospheric air almost always contains a significantly higher percentage of:
- AO2
- BCO2
- CN2
- DH2
36Considering a soil as a medium for plant growth in terms of aeration, water supply, and temperature, the most desirable structural type is:
- Agranular
- Bplaty
- Cangular blocky
- Dsingle grain
37In a clay loam soil horizon having a strongly developed fine, granular structure, the soil aeration is likely to be:
- Agood
- Bfair
- Cpoor
38The soil components - air, solution, solids - arranged in order of increasing heat conductance (lowest heat conductance first) are:
- Aair, solution, solids
- Bsolids, air, solution
- Csolids, solution, air
- Dair, solids, solution
39The subsoil in College Station, Texas, is warmer than either the surface soil or the parent material:
- Ain the summer
- Bin the spring
- Cin the fall
- Din the winter
40Daily fluctuations in temperature at 2 cm below the soil surface, when compared to daily fluctuations at 15 cm below the soil surface:
- Aoccur later in the day
- Bare of greater magnitude
- Coccur more frequently
- Doccur less frequently
41The amount of heat stored in the soil in the fall at a given location is primarily a function of soil:
- Amoisture
- Btexture
- Cclay
- Dorganic matter
42Water in soil is:
- Aa basic solution
- Ba transporting medium
- Ca poor heat sink
- Dfree of ions
43Availible water in soils is water held between the wilting coefficient and:
- Afield capacity
- Bsaturation
- Chydroscopic water
- Dmaximum retentive capacity
44Water which drains downward in a soil consists of water which moves in response to differences in:
- Aosmotic and matric potentials
- Bmatric and gravitational potentials
- Cmatric potential only
- Dgravitational potential only
45Water enters a very sandy subsoil from a clayey surface soil:
- Aonly when large pores are filled
- Bonly after the clayey soil is saturated
- Cunder a gravitational potential gradient
- Dwhen soil moisture tension is lowest in the subsoil
46In a soil layer containing large holes or channels open at the surface, water enters the large holes:
- Aby gravity flow only
- Bwhen the water reaches it
- Cunder tension
- Dby capillary flow only
Información
- Descripción
- Test sobre Test#1 SCSC301, creado por Dylan Buysse el 08/06/2015.
- Autor
- Dylan Buysse
- Idioma
- English
- Visitas
- 1
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