1、3气象(1)The approximate percentage of oxygen at ground level is A20% B15% C41% 正确答案：A (2)Where is a common location for an inversion? ATropopause BStratosphere CBase of cumulus clouds 正确答案：B (3)The section of the atmosphere surrounding the earth and closest to surface is called Atroposphere BStratosph
2、ere Ctropopause 正确答案：A (4)What feature is associated with a temperature inversion? Aa stable layer of air Ban unstable layer of air Cair mass thunderstorms 正确答案：A (5)What characterizes a ground-based inversion? Aconvection currents at the surface Bcold temperatures Cpoor visibility 正确答案：C (6)What co
3、ndition produces the most frequent type of ground-or surface-based temperature inversion? Athe movement of colder air under warm air or the movement of warm air over cold air Bwidespread sinking of air within a thick layer aloft resulting in heating by compression Cterrestrial radiation on a clear,
4、relatively calm night 正确答案：C (7)What is a characteristic of the troposphere? Ait contains all the moisture of the atmosphere Bthere is an overall decrease of temperature with an increase of altitude Cthe average altitude of the top of the troposphere is about 6 miles 正确答案：B (8)The heat of the strato
5、sphere air is chiefly from Athe absorption of sun radiation by the water vapor Bthe absorption of sun ultraviolet ray radiation by the ozone Cthe absorption of ground radiation by the air. 正确答案：B (9)The time of the day when the earths surface gives off the greatest amount of terrestrial radiation is
6、 Aa few hours before midnight Bat sunset Cmid afternoon 正确答案：C (10)When does min temperature normally occur during a 24 hours period? about 1 hour before sunrise at midnight after sunrise 正确答案：c 由于太阳辐射强度的日变化，气温在一日之中也呈现周期性变化，有一个最低值和最高值，最低值一般出现在早晨日出后，最高值出现在当地正午后 2小时左右。(11)The heat of the troposphere a
7、ir is chiefly from Athe absorption of sun radiation by the water vapor Bthe absorption of sun ultraviolet ray radiation by the ozone Cthe absorption of ground radiation by the air 正确答案：C (12)Which of the following is not correct? Asolar radiation penetrates the atmosphere more readily than terrestri
8、al radiation6 Bthe amount of solar radiation absorbed at the earth surface is independent of the type of surface Cwater vapour and carbon dioxide are important absorbers of terrestrial radiation 正确答案：A (13)What is the approximate rate unsaturated air will cool flowing upslope? A3C per 1,000 feet B2C
9、 per 1,000 feet C4C per 1,000 feet 正确答案：A (14)Which process causes adiabatic cooling? expansion of air as it rises movement of air over a colder surface release of latent heat during the vaporization process 正确答案：A (15)Which term applies when the temperature of the air changes by compression or expa
10、nsion with no heat added or removed? AKatabatic BAdvection CAdiabatic 正确答案：C (16)When saturated air moves downhill, its temperature increases at a faster rate than dry air because of the release of latent heat at a slower rate than dry air because condensation releases heat at a slower rate than dry
11、 air because vaporization uses heat 正确答案：C (17)A record of atmospheric temperature can be read for a Abarograph Bthermogram Cthermograph 正确答案：B (18)In average, for every 1,000 feet increase in the troposphere, the temperature of the air will Adescend 2C Bdescend 3C Cdescend 4C 正确答案：A (19)A temperatu
12、re of 45 is A57 or 273K B113 or 273K C113 or 318K 正确答案：C K=273.15+攝氏溫度 c=(-32)*5/920)What condition produces the most frequent type of ground-or surface-based temperature inversion? Athe movement of colder air under warm air or the movement of warm air over cold air Bwidespread sinking of air within
13、 a thick layer aloft resulting in heating by compression Cterrestrial radiation on a clear, relatively calm night 正确答案：C (21)What is the primary cause of all changes in the Earths weather? Achange in air pressure over Earths surface Bvariation of solar energy at surface Cmovement of air mass from mo
14、ist areas to dry areas 正确答案：B (22)The surface air temperature of a running will depend on all of the following Aairfield elevation, runway length and slope, airfield latitude and wind Bairfield elevation and latitude time of the year, time of day, runway surface prevailing wind and cloud cover Cairf
15、ield elevation runway length, prevailing wind and the time of day 正确答案：B (23)Which pressure is defined as station pressure? AAltimeter setting. BActual pressure at field elevation. CStation barometric pressure reduced to sea level. 正确答案：B (24)Dew point is Athe temperature to which dry air must be co
16、oled in order to just reach saturation Bthe temperature at which a parcel at air reach super saturature point, irrespective of pressure Cthe TEM to which saturated air must be cooled to produce condensation正确答案：A (25)The dew point temperature is higher when air is very warm and dry air is very cold
17、and moist air pressure is lower正确答案：B 露点温度和空气中水汽含量和气压大小有关。气压一定时，水汽含量越多，露点温度越高；在水汽含量不变的情况下，气压降低时，露点温度随之降低。(26)What weather condition occurs at the altitude where the dewpoint lapse rate and the dry adiabatic lapse rate converge? precipitation starts cloud bases form stable air changes to unstable air
18、正确答案：B (27)What weather difference is found on each side of a “dry line”? extreme temperature difference strut versus cumulus clouds dewpoint difference正确答案：C (28)The human body is comfortable at normal temperatures. When the relative humidity is? A60-80% B40-60% C20-30%正确答案：B (29)The relative humid
19、ity will be 100% when Adew point Bwet bulb and dry bulb equal Cdew pointdry bulb正确答案：B (30)The water vapor held in unsaturated air is Ainvisible always Bvisible always Cvisible only if temperature is low enough正确答案：A (31)Which event usually occurs after an aircraft passes through a front into the co
20、lder air temperature/dewpoint decreases atmosphere pressure increases wind direction shifts to the left正确答案：B (32)Water is said to have a greater value of specific heat as compared with the land, because its able to absorb more heat than the land, but has no bearing on the rate of change in the temp
21、erature it requires less heat be taken into change it temperature as compared with the land it requires more heat to increase it temperature than land正确答案：C (33)With the increase of temperature, the airplanes rolling distance will _when takeoff and landing. Aremain unchanged Bincrease Creduce 正确答案：B
22、 (34)Which are the only cloud types forecast in the Terminal Aerodrome Forecast? AAltocumulus BCumulonimbus CStratocumulus正确答案：B (35)Before takeoff, the pilots find the clouds have the following: very low and thick clouds, flat and gray bottoms with light rain. This clouds is referred as Astratus or
23、 nimbostratus Baltostratus or stratocumulus Ccumulonimbus or altocumulus 正确答案：A (36)Which type clouds may be associated with the jetstream？ cirrus clouds on the equatorial side of the jetstream cumulonimbus cloud line where the jetstream crosses the cold front cirostratus cloud band on the polar sid
24、e and under the jetstream正确答案：A (37)What is the lowest cloud in the stationary group associated with a mountain wave? rotor cloud standing lenticular low stratus正确答案：A 山地有许多由于地形影响而形成的特殊的地形云，如荚状云、滚轴状云和帽状云。荚状云可出现在不同高度上，可以是层积云、高积云或者卷云；滚轴状云通常底部低于山峰，顶部可高出山峰顶许多；帽状云只形成在山顶上空。(38)The height of the lowest clo
25、ud in the report was (BKN080) A1000FL AGL B800FL AGL C8000FL AGL正确答案：C (39)In flight, pilots find forane clouds consisting of cloud bar and cloud band with flat floor and piled clouds on the top of some clouds. The descriptive cloud should be. Acumulus congestus Bcumulostratus Ctowering clouds 正确答案：
26、C (40)When flying over the nimbostratus clouds, the pilot finds that there are uptowering clouds on the thick layer. Top of the towering clouds extends to 9000 meters high and are blown to one side by the strong wind like horses mane. Based on this situation, he predicts that there must be ( ) in th
27、e sheet clouds. Acumulonimbus clouds Baltocumulus clouds Cfalse cirrus clouds 正确答案：A (41)The heaviest icing that easy to accumulate in flight is associated with Ain cumuloniform clouds Bin high clouds, such as cirrus Cin altocumulus cloud正确答案：A (42)The clouds which can produce thunderstorm and hail
28、are Animbostratus Bcumulonimbus Caltostratus正确答案：B (43)Clouds are divided into three families according to their height range composition outwardshape正确答案：A (44)Which type clouds are indicative of very strong turbulence? Animbostratus Bstanding lenticular Ccirrocumulus正确答案：B (45)Airplanes may encoun
29、ter heavy turbulence in Acumulonimbus and towering cumulus Bstratocumulus and altocumulus Caltocumulus and cumulonimbus 正确答案：A (46)What are basic conditions to form a thunderstorm? Aan unstable lapse rate and terrain lifting force Ban unstable lapse rate, an initial lifting force, and sufficient wat
30、er vapor Csufficient water vapor and front area正确答案：B (47)When taking off or landing at the airport on the edge of thunderstorm region, which of the following descriptive weather should be watchouted particularly? Avisibility and low clouds Bwindshear at low altitude Chail and rainstorm正确答案：B (48)Wh
31、at feature is normally associated with the cumulus stage of a thunderstorm? Abeginning of rain at the surface Bfrequent lightning Ccontinuous updraft正确答案：C (49)Summer thunderstorms in the arctic region will generally move southwest to northeast with the jetstream flow directly north to south with th
32、e low level polar airflow northeast to southwest in polar easterlies正确答案：C (50)There is ribbon like precipitation under the clouds but it evaporated before reaching the ground. This phenomenon is referred to as Aplume Bvirga Cdowndraft 正确答案：B (51)What is a feature of supercooled water? Athe water dr
33、op sublimates to an ice particle upon impact Bthe unstable water drop freezes upon striking an exposed object Cthe temperature of the water drop remains at 0 until it impacts a part of the airframe, then clear ice accumulates正确答案：B (52)What temperature condition is indicated if precipitation in the
34、form of wet snow occurs during flight? Athe temperature is above freezing at flight altitude Bthe temperature is above freezing at higher altitudes Cthere is an inversion with colder air below正确答案：A (53)What is the expected duration of an individual microburst? Atwo minutes with maximum winds lastin
35、g approximately 1 minute Bone microburst may continue for as long as 2 to 4 hours Cseldom longer than 15 minutes from the time the burst strikes the ground until dissipation 正确答案：C (55)Atmosphere pressure change due to a TS will be at the lowest value Aduring the downdraft and heavy rain showers Bwh
36、en the TS is approaching Cimmediately after the rain shower have stopped正确答案：B (56)Which of the following cases provides impulse force for forming heat thunderstorm? Awater vapor coagulating and then releasing latent heat Brising terrain Cuneven heat on the ground 正确答案：C 热雷暴由热力对流产生，其形成原因有因为地表性质分布不均，
37、近地面气层中的相邻空气间存在温度差异，气层中会有热力对流产生而形成。(57)The embedded thunderstorm is suddenly and violently and Athey are obscured by other type of clouds Bthey are predicted to develop in a stable air mass Cthey are embed a squall line正确答案：A (58)Which of the following is the characteristic of heat thunderstorm? Ait
38、moves with the weather system Bit covers small area and is isolated with openings Cit strengthens at night and weakens in the day on land正确答案：B 由于热力对流往往不够强盛，因而热雷暴表现出范围小、孤立分散、各个雷暴云间通常有明显间隙的特点。随着气温日变化，热雷暴也表现出明显的日变化，在大陆上热雷暴多出现在午后或傍晚，入夜以后，热雷暴逐渐消散；而在海洋或湖泊上空，热雷暴多出现在夜间或黎明，白天减弱和消散。(59)Which of the following
39、 cases provides impulse force for forming heat thunderstorm? Awater vapor coagulating and then releasing latent heat Brising terrain Cuneven heat on the ground正确答案：C (60)Tropical thunderstorm occurring in the hours just before down is most likely to form Aover coast waters with tendency Binland in s
40、ubcontinental area Cover coastal land areas with正确答案：A (61)Which of the following statements about “hailstone“ is correct? Aground rain means that the hailstone disappears in the air Btowering clouds usually produce hailstones Cthe hail can be thrown several kilometers out of the thunderstorm正确答案：C
41、(62)Which of the following weather phenomenon signals that thunderstorm is at its mature phase? Athe appearance of disordered low clouds Bthe appearance of anvil clouds top Cit begins to rain on the ground 正确答案：C (63)Which weather phenomenon signals the beginning of the mature stage of a thunderstorm? AThe appearance of an anvil top. BThe start of rain at the surface. CGrowth rate of the cloud is at its maximum.正确答案：B (64)Which type precipitation is an indication that supercooled water is present? Awet snow Bfreezing rain Cice pellets
