LESSON 4
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct
answer for each item. When you have completed the exercise, check your answer with the answer key
that follows. If you answer any item incorrectly, study again that part which contains the portion
involved.
1.
As in all topographic or geodetic surveys, the observations and computations have a known basis
to 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 ellipsoid
B.
The North American datum
C.
The MSL
D.
The European datum
2.
_______________________ are permanent material objects, natural or artificial, bearing a
marked point whose elevation above or below the adopted datum
A.
Triangulation stations
B.
TBMs
C.
Benchmarks
D.
LaPlace stations
3.
The primary difference between second-order, Class I and Class II lines is that Class II lines
___________________________________________________________________________________.
A.
Are run in one direction only
B.
Have an AE of ...8.4
C.
Are used for distances under 40 kilometers
D.
Are used in easily accessible areas
4.
Precise levels (first- and second-order instruments) have the ability to allow a reading to the
nearest _____________________________________________________________________________.
A.
0.001 of a unit
B.
0.01 of a unit
C.
0.1 of a unit
D.
1.0 of a unit
EN0593
4-34
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