surveying iii (topographic and geodetic surveys) - Modern Prepper

LESSON 4PRACTICE EXERCISEThe following items will test your grasp of the material covered in this lesson. There is only one correctanswer for each item. When you have completed the exercise, check your answer with the answer keythat follows. If you answer any item incorrectly, study again that part which contains the portioninvolved.1. As in all topographic or geodetic surveys, the observations and computations have a known basisto work on or have a reference datum on which to work. In geodetic leveling this reference datum,which is universal, is known as ______________.A. Clarke's ellipsoidB. The North American datumC. The MSLD. The European datum2. _______________________ are permanent material objects, natural or artificial, bearing amarked point whose elevation above or below the adopted datumA. Triangulation stationsB. TBMsC. BenchmarksD. LaPlace stations3. The primary difference between second-order, Class I and Class II lines is that Class II lines___________________________________________________________________________________.A. Are run in one direction onlyB. Have an AE of ±8.4C. Are used for distances under 40 kilometersD. Are used in easily accessible areas4. Precise levels (first- and second-order instruments) have the ability to allow a reading to thenearest _____________________________________________________________________________.A. 0.001 of a unitB. 0.01 of a unitC. 0.1 of a unitD. 1.0 of a unitEN0593 4-34