CHAPTER 1 RADIO WEATHER MESSAGES
1.[3251]______ causing strong winds and rough sea north west Bay of Biscay． A. Strong low pressure B. Strong high pressure C. Steep pressure gradient D. Steep gradient pressure KEY: C
2.[3252]A boundary between two air masses is a(n) ______. A. lapse rate B. isobar C. front D. continent KEY: C
3.[3255]A cyclone in its final stage of development is called a(n) ______. A. tornado B. anticyclone
C. occluded cyclone or occluded front D. polar cyclone KEY: C
4.[3257]A generally circular low pressure area is called a(n) ______. A. cyclone B. anticyclone C. cold front D. occluded front KEY: A
5.[3258]A hygrometer is a device used for determining ______. A. the absolute temperature B. atmospheric pressure C. wind velocity D. relative humidity KEY: D
6.[3259]A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n) ______. A. occluded front B. warm front C. cold front D. warm sector KEY: C
7.[3260]A sea breeze is a wind ______. A. that blows towards the sea at night B. that blows towards an island during the day C. caused by cold air descending a coastal incline D. caused by the distant approach of a hurricane KEY: B
8.[3265]Advection fog is most commonly caused by ______. A. air being warmed above the dew point B. saturation of cold air by rain
C. a rapid cooling of the air near the surface of the Earth at night D. warm moist air being blown over a colder surface KEY: D
9.[3267]An instrument designed to maintain a continuous record of atmospheric pressure is a(n) ______.
A. mercurial barometer B. aneroid barometer C. barograph D. thermograph KEY: C
10.[3269]An occluded front is usually caused by a ______. A. cold front becoming stationary B. warm front becoming stationary C. cold front overtaking a warm front D. warm front dissipating KEY: C
11.[3270]As a cold front passes an observer，pressure ______. A. drops and winds become variable B. rises and winds become gusty C. drops and winds become gusty D. rises and winds become variable KEY: B
12.[3271]Brief，violent showers frequently accompanied by thunder and lightning are usually associated with ______. A. passage of a warm front B. passage of a cold front
C. winds shifting counterclockwise in the Northern Hemisphere D. stationary high pressure systems KEY: B
13.[3275]Clouds are classified according to their ______. A. size
B. moisture content
C. altitude and how they were formed D. location in a front KEY: C
14.[3283]In the Northern Hemisphere，an area of counterclockwise wind circulation surrounded by higher pressure is a ______. A. low B. high C. warm front D. cold front
KEY: A
15.[3285]In the Northern Hemisphere，the largest waves or swells created by a typhoon or hurricane will be located ______.
A. in the southeast quadrant of the storm B. directly behind the storm center C. forward and to the right of its course D. behind and to the left of its course KEY: C
16.[3290]Pressure gradient is a measure of ______. A. a high-pressure area
B. pressure difference over horizontal distance C. pressure difference over time D. vertical pressure variation KEY: B
17.[3291]Prior to reading an aneroid barometer，you should tap the face lightly with your finger to ______.
A. expose any loose connections B. demagnetize the metal elements
C. bring the pointer to its true position D. contract and expand the glass face KEY: C
18.[3292]The atmosphere in the vicinity of a high pressure area is called a(n) ______. A. anticyclone B. cold front C. occluded front D. cyclone KEY: A
19.[3294]The fog produced by warm moist air passing over a cold surface is called ______. A. conduction fog B. radiation fog C. frontal fog D. advection fog KEY: D
20.[3300]The navigable semicircle of a tropical storm in the South Indian Ocean is located on which side of the storm's track? A. Rear B. Front C. Left D. Right KEY: D
21.[3301]When winds of force reach 10-11 in Beaufort Scale，usually we call such winds as ______. A. Hurricane B. Breeze C. Storm
D. Gale KEY: C
22.[3302]The Routing System which aimed at reducing the risk of casualties is called as ______. A. Traffic Separation Schemes B. Recommended tracks C. Precautionary areas D. Inshore traffic zones KEY: A
23.[3305]______ rain means it rains in some parts of the area． A. Squally B. Isolated C. Scattered D. Occasional KEY: C
24.[3306]{On account of} the bad weather，my ETA is amended to read 1830 his on July 15th． A. For the account of B. Because C. Owing to D. For fear of KEY: C
25.[3309]A line on a weather chart connecting places which have the same barometric pressure is called an ______. A. isotherm B. isallobar C. isobar D. isotope KEY: C
26.[3310]A local wind which occurs during the daytime and is caused by the different rates of warming of land and water is a ______. A. foehn B. chinook C. land breeze D. sea breeze KEY: D
27.[3315]A millibar is a unit of ______. A. humidity B. precipitation C. pressure D. temperature KEY: C
28.[3322]A weather forecast states that the wind will commence backing. In the Northern Hemisphere，this would indicate that it will ______. A. shift in a clockwise manner B. shift in a counterclockwise manner
C. continue blowing from the same direction D. decrease in velocity KEY: B
29.[3323]A weather map is a synoptic data because it ______. A. summarizes a great deal of information B. can be interpreted accurately C. appears daily
D. is prepared by the Weather Bureau KEY: A
30.[3324]A WIND BLOWS ROUND ANTICLOCKWISE defines ______. A. Backing (of wind) B. Beach (to) C. Veering (of wind)
D. Maintaining direction of the wind KEY: A
31.[3326]After a cold front passes，the barometric pressure ______. A. drops，and the temperature drops B. drops，and the temperature rises C. rises，and the temperature drops D. rises，and the temperature rises KEY: C
32.[3328]An air mass is termed warm if ______. A. it is above 70°F
B. the ground over which it moves is cooler than the air C. it originated in a high pressure area D. it originated in a low pressure area KEY: B
33.[3330]An occluded front on a weather map is colored ______. A. blue line B. purple line C. dashed blue line
D. alternate red and blue line KEY: B
34.[3331]Anticyclones are usually characterized by ______. A. dry，fair weather
B. high winds and cloudiness
C. gustiness and continuous precipitation D. overcast skies KEY: A
35.[3332]As the temperature for a given mass of air increases，the ______. A. dew point increases B. dew point decreases
C. relative humidity increases D. relative humidity decreases