11-35. Which of the following types of thunder- 

 storms occurs when a wedge of cold air 

 moves into a body of warm, moist, 

 unstable air? 



1. Air-mass 



2. Cold-front 



3. Convective 



4. Orographic 



11-36. Heating of the air by the underlying sur- 

 face may result in the development of a 



1. prefrontal thunderstorm 



2. convective thunderstorm 



3. warm-front thunderstorm 



4. squall-line thunderstorm 



11-37. Convective thunderstorms that occur over 

 bodies of water usually form during the 



1. early evening and dissipate in the 

 late morning 



2. late afternoon and dissipate in the 

 early morning 



3. early morning and dissipate in the 

 late afternoon 



4. late afternoon and dissipate in the 

 early evening 



11-38. Where do orographic thunderstorms form? 



1. In mountainous areas 



2. Over large bodies of water 



3. Over low, relatively flat land 



4. Over lowlands near large bodies of 

 water 



In items 11-41 through 11-43, select from column 

 B the oceanographic related term or phrase iden- 

 tified by each definition in column A. 



Definitions 



11-41. The loss of sound 

 energy due to 

 absorption and 

 scattering 



11-42. The reduction of 

 sound intensity 

 through the conver- 

 sion of sound energy 

 into heat due to 

 friction of dense 

 water 



11-43. The boundary where 

 the ocean's surface 

 and the earth's 

 atmosphere meet 



B. Terms and 

 Phrases 



1. Air-sea 

 interface 



2. Absorption 



3. Attenuation 



4. Thermocline 



In items 11-44 through 11-47, select from column 

 B the definition of each oceanographic related 

 term or phrase in column A. 



Terms and 

 Phrases 



B. Definitions 



11-39. From a station, which of the following is 

 the most accurate means of tracking the 

 movements of a thunderstorm? 



1. Making reconnaissance flights 



2. Plotting 3-hourly synoptic charts 



3. Using radar with PPI presentations 



4. Checking airways sequence reports 



11-40. A luminous phenomenon which appears in 

 the high atmosphere in the form of arcs 

 or bands is referred to as 



1. lightning 



2. an airglow 



3. cloud discharges 



4. an aurora 



Learning Objective: Define speci- 

 fic oceanographic related terms 

 and phrases, and identify ocean 

 bottom topography. 



11-44. Isovelocity 

 gradient 



11-45. Refraction 



11-46. Reflection 



11-47. Scattering 



Sound energy 

 reflected from the 

 sea surface, bot- 

 tom, and/or parti- 

 cles dispersing in 

 a random fashion 



Sound waves return- 

 ing to the water 

 after striking 

 abrupt surfaces 



Sound waves in a 

 given water column 

 having the same 

 velocity throughout 



Sound waves bending 

 or curving as they 

 pass from one 

 medium to another 



67 



