LESSON ONE
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only
correct answer to each item. When you have completed the exercise, check your answers
with the answer key that follows. If you answer any item incorrectly, study again that part of
the lesson which contains the portion involved.
NOTE:
Replace page 35 with photo page 35 attached in back of the subcourse booklet for
better viewing.
1.
At certain times during the day, particularly around sunrise or sunset, objects on the
ground exhibit peculiar properties. In fact some objects seem to "disappear." What is this
phenomenon called?
A. Crossover time.
B. Blackbody effect.
C. Ghosting.
D. Atmospheric attenuation.
2.
Atmospheric attenuation is the effect of all the following EXCEPT:
A. Vapor gases and dust in the atmosphere.
B. Fog.
C. Rain.
D. Cosmic radiation.
3.
What type of sensor is the AN/AAS-24?
A. Radar.
B. Photo.
C. Active.
D. Passive.
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