3-373-383-39What is the value for D30 for thissoil sample?1. 3.02. 4.83. 5.64. 6.2What is the coefficient ofcurvature (Cc) of this soil sample?1. 5.62. 12.73. 21.94. 52.0What is the classification of thissoil sample?1. GW2. GP3. SW4. SPLearning Objective: Identify thetest procedures used in the fieldto identify soil characteristics.3-40.Why is it also necessary to performfield identification tests on soilseven when laboratory tests arerequired during soil explorations?1.To determine which laboratorytests will be omitted2.To minimize the duplication oflaboratory tests samples3.To provide duplicate resultsfor positive identification4.To ensure there are no errorsin the laboratory tests3-41.What is the best way to gain thenecessary skills required for fieldtesting?1.By working with experiencedtechnicians2.By receiving formal soilstraining3.By getting the “feel” of thesoil during the laboratorytests3-42.What is the most useful tool forperforming field identificationtests?1.A hand auger2.A scale or balance3.A No. 40 sieve4.A No. 200 sieve3-43.3-44.3-45.3-46.3-47.3-48.When identifying soils in thefield, which of the soil propertiesshould you include in thedescription of the soil?1.Color2.Percentage of sand3.Maximum particle Size4.Particle shapeVisual examination is used toestablish which of the followingproperties of the soil?1.Color2.Grain distribution3.Cohesiveness of the soil4.Grain shape of the finesWhen the color of a soil has beenidentified through a visualexamination, what other data shouldyou note regarding the soilcondition at the time ofidentification?1.Temperature2.Maximum particle size3.Chemical content4.Moisture contentDuring visual examination of a soilsample, you notice a yellow color.What can you conclude about thesoil from this observation?1.Organic material is present2.Iron oxides are present3.The soil has poor drainagecapabilities4.Aluminum compounds are presentWhat is the first step inapproximating grain-sizedistribution in fieldidentification?1.Separating the larger particles2.Examining the coarse-grainedsoil for gradation distribution3.Estimating the percentage offine-grained soil4.Performing the sieve samplingYou have determined the soil to becoarse-grained and estimated thefines to be 4 percent. What is thesoil classification of the soil?1. GW-GM2. SW-SM3. GC4. Gravel or sand, depending onadditional information17
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