1. the atmosphere

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THE ATMOSPHERE

DGCA EXAMS APRIL 2012 SESSION Page 1

1. Which of the following describes the tropopause?a) The point where temperature increases with heightb) A layer between the troposphere and the stratospherec)

The boundary between the troposphere and the stratosphere

d) All of the above2. What is the coldest time of the day?

a) One hour before dawnb) Thirty minutes before dawnc) Dawnd) Thirty minutes after dawn

3. What is the height and temperature of the tropopause?a) 8km and -40 degree Celsius at equatorb) 16km and -75 degree Celsius at the equatorc) 16km and -40 degree Celsius at the polesd) 8km and -75 degree Celsius at the poles

4. What is the pressure lapse rate at 5500m in the ISA atmosphere?a) 27 feet/hpab) 50 feet/hpac) 100 feet/hpad) 150 feet/hpa

5. What is the lowest temperature in ISA?a) -50.6Cb) -56.5Cc) -100Cd) 56.5C

6. Where is the ozone layer?a) Stratosphereb)

Troposphere

c) Tropopaused) Ionosphere

7. The tropopause is?a) The line where the temperature no longer decreases with heightb) The layer between the tropopause and the stratospherec) The layer beyond which only CI cloud occurd) The line indicating clear air turbulence

8. One of the most important characteristics of the atmosphere is?a) Density is constant above 10,000 feet


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b) Air is a poor conductor of heatc) Temperature lapse rate is very frequently above 3C /1000 feet.d) The air is a good conductor of heat.

9. Most of the water vapour in the atmosphere is contained in the?a) Tropopauseb) Stratospherec) Troposphered) Stratopause

10.The captain of an aircraft needs to know the height of the tropopause becausea) It normally represents limit of the weatherb) Density starts to increasec) There are no longer jet streams and CATd) It indicates the height of the thermal wind

11.The level of the atmosphere where temperature ceases to fall with increase in height isknown as

a) Troposphereb) Stratopausec) Stratosphered) Tropopause

12.Which statement is correct when considering the lowest layers of the atmosphere?a) The majority of the weather is contained in the stratosphere and its upper boundary is

the tropopause

b) The majority of the weather is contained in the troposphere and its upper boundary isthe tropopause

c) The majority of the weather is contained in the tropopause and its upper boundary isthe troposphere

d) The majority of the weather is contained in the troposphere and its upper boundary isthe stratosphere

13. In ISA the temperature is isothermala) Up to 36090 feet/11kmsb) From 36090 feet/11kms to 65617 feet/20kmsc) From 36090 feet/11kms to 104987 feet/32kmsd) 36090 feet/11kms to 45090 feet/13.75kms

14. ISA assumes that sea level atmospheric pressure isa) 1013.25 HPA and decreases with increase in heightb) 1013.25 HPA and increases with increase in heightc) 1013.25 HPA and falls to about half this value at 30,000 feet


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b) Varies with altitudec) Varies with latituded) None of the above

22.Above 8km lower temperatures are overa) Polesb) Mid-latitudesc) Equator

23.The atmosphere is heated bya) Solar radiationb) Heat from the earth surfacec) Heat from aboved) By winds

24.Tropos meansa) Turningb) Under currentc) Convection

25.CO2 and H2O are also calleda) Greenhouse gasesb) Rare earth gasesc) Essential gasesd) None

26.Troposphere is generallya) Stableb) Unstablec) Neutral

27.Stratosphere isa)

Stable

b) Unstablec) Neutral

28.Tropopause is discontinuous at abouta) 30Latb) 40Latc) 60Latd) Equator

29.Most of the atmospheric mass is contained in thea) Troposphere


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b) Stratospherec) Hetrosphered) Tropopause

30.Stratosphere extends from tropopause toa) 30kmsb) 40kmsc) 50kmsd) 60kms

31.The middle atmosphere level with temperature inversion and stability is calleda) Troposphereb) Tropopausec) Stratosphered) Stratopause

32.Mother of pearl cloud occurs ina) Mesosphereb) Thermospherec) Stratosphered) Troposphere

33.The temperature in ISA at 17km isa) -56.5Cb) -65.5Cc) -35.5Cd) -56.6C

34.The ratio of oxygen to nitrogen by weight in atmosphere isa) 1:2b) 1:3c) 1:4d)

1:5

35.The ratio of oxygen to nitrogen by volume in atmosphere isa) 1:2b) 1:3c) 1:4d) 1:5

36.The proportion of CO2 in the atmosphere isa) 3%b) 0.3%c) 0.03%


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37.Maximum concentration of Ozone is at a height ofa) 10-15kmsb) 15-20kmsc) 20-25kmsd) 25-30kms

38.Supplemental oxygen is required when flying abovea) 5000 feetb) 7000 feetc) 10000 feetd) 13000 feet

39.CO2 and H2O keep the atmospherea) Warmb) Coldc) Have no effect

40.Noctilucent clouds occur ina) Thermosphereb) Mesospherec) Stratosphere

41.Temperature at 2 km is 05c, what is the ISA deviationa) -05cb) -02cc) 03c

42.Pressure at MSL is 1002.25 HPA , find the ISA deviationa) -11 HPAb) 10 HPAc) 12 HPAd) 14 HPA

43. In actual atmosphere temp at 19km is -60c, find the ISA deviationa) -4.5b) -5.5cc) -3.5c

44.Half of the atmospheric air mass is contained belowa) 20,000 feetb) 15,000 feetc) 10,000 feetd) 18,000 feet


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45. In JSA the lapse rate isa) 2c/1000 feetb) 2c/kmc) 5c/kmd) 1.98c/1000 feet

1. the atmosphere

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