3-12. Which of the following requirements is true of a test pit excavation? 1. Must be large enough for a man to  enter 2. Must be made with power-driven equipment 3. Must be below the water table 4. Load-bearing tests must be performed on soil samples taken every  18  inches 3-13. Test holes are best performed on what type of soil? 1. Cohesiveless soil below the water table 2. Cohesiveless soil above the water table with large aggregate 3. Cohesive  soil 4. Bedrock 3-14. Soil samples obtained by digging test holes are used for which of the following test purposes? 1. Soil classification 2. Compaction 3. Moisture Content 4. Each of the above 3-15. What method is commonly used commercially to make deep test holes? 1. Wash boring 2. Core boring 3. Drilling 4. Auger boring 3-16. Undisturbed samples are used to test which of the following qualities  of  the  soil? 1. Saturation  point 2. Cohesiveness 3. Shear strength 4. Load-bearing strength 3-17. You must determine subgrade conditions for construction of a new road. What is the next step once the field reconnaissance has been  completed? 1. Develop soil profiles 2. Classify  the  soil 3. Obtain samples for laboratory testing 4. Perform  preliminary  borings  at appropriate   locations 3-18. When performing soils investigation on possible borrow areas, you should make borings to what depth? 1. 10 feet 2. The depth of planned excavation 3. 2 - 4 feet below anticipated excavation 4. Same  depth  as  all  other  borings 3-19. When  performing  soils  surveys, which of the following sources should you use to obtain information  pertinent  to  the  area? 1. Local  contractors 2. Existing mine shafts of earth cellars 3. Eroded  slopes 4. All of the above 3-20. Detailed soil explorations should be performed at what type of site? 1. Proposed  center  line 2. Proposed large cut location 3. Extreme  grade  shift 4. Proposed pavement location 3-21. What minimum spacing, if any, is required between boring holes? 1. 25 feet 2. 50 feet 3. 100 feet 4. None Learning  Objective:  Identify  the classification of soils according to the Unified Soil Classification System and solve mathematical problems related to soil classification. 3-22. Highly organic soil is identified by  what  manner? 1. More than 50 percent passing a No. 200 sieve 2. 50 percent or more retained on a No. 200 sieve 3. Determining that the sample is neither a fine-grained nor coarse-grained   soil 4. Visual inspection 3-23. The Unified Soil Classification System uses what number of groups for  soil  classification? 1. Five 2. Seven 3. Fifteen 4. Thirty 15