ATMOSPHERE – Air – DGCA Question Bank For Politics

#1. How does temperature vary with increasing altitude in the ICAO standard atmosphere below the tropopause?

Increases

At first it increases and higher up it decreases

Remains constant

Decreases

#2. Which is true of the temperature at the tropopause?

It is higher in polar regions than in equatorial regions

It is higher in equatorial regions than in Polar Regions

It is highest in middle latitudes

There is no significant difference with change of latitude

#3. What is the boundary layer between troposphere and stratosphere called?

Tropopause

Ionosphere

Stratosphere

Atmosphere

#4. How would you characterise an air temperature of -15°C at the 700 hPa level over Western Europe?

Low

High

Within +/-5°C of ISA

20°C below standard

#5. The temperature at FL 110 is -5°C. What will the temperature be at FL 50 if the ICAO standard lapse rate is applied?

+3°C

0°C

-3°C

+7°C

#6. How does the height of the tropopause normally vary with latitude in the northern hemisphere?

It remains constant throughout the year

It decreases from south to north

It remains constant from north to south

It increases from south to north

#7. The temperature at FL 80 is +6°C. What will the temperature be at FL 130 if the ICAO standard lapse rate is applied?

+2°C

-4°C

-6°C

0°C

#8. The lowest assumed temperature in the ICAO Standard Atmosphere is :

-273°C

-44.7°C

-100°C

-56.5°C

#9. The troposphere is the:

part of the atmosphere below the tropopause

part of the atmosphere above the stratosphere

boundary between the mesosphere and thermosphere

boundary between the stratosphere and the mesosphere

#10. How would you characterise an air temperature of -55°C at the 200 hPa level over Western Europe?

Within +/-5°C of ISA

High

Low

Very high

#11. The height and the temperature of the tropopause are respectively in the order of

8 km and -40°C over the equator

8 km and - 75°C over the poles

16 km and -40°C over the poles

16 km and -75°C over the equator

#12. What of the following is the most important constituent in the atmosphere from a weather stand-point?

Nitrogen

Oxygen

Hydrogen

Water vapour

#13. What is the vertical temperature lapse rate, up to 11 km, in the ICAO standard atmosphere?

6.5°C per 1000 m

4.5°C per 1000 m

3°C per 1000 m

2°C per 1000 m

#14. An outside air temperature of -35°C is measured while cruising at FL 200. What is the temperature deviation from the ISA at this level?

10°C warmer than ISA

5°C warmer than ISA

5°C colder than ISA

10°C colder than ISA

#15. How would you characterise an air temperature of -30°C at the 300 hPa level over Western Europe?

Within +/-5°C of ISA

Low

Very low

High

#16. The rate of decrease of temperature with height per 100 m in the International Standard Atmosphere is:

0.65°C

1°C

0.5°C

variable

#17. What is the approximate composition of the dry air by volume in the troposphere?

50 % oxygen, 40 % nitrogen, and the rest other gasses

21 % oxygen, 78 % nitrogen, and the rest other gasses

10 % oxygen, 89 % nitrogen, and the rest other gasses

88 % oxygen, 9 % nitrogen, and the rest other gasses

#18. If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?

-15°C

-30°C

-45°C

-60°C

#19. A temperature of +15°C is recorded at an altitude of 500 metres above sea level. If the vertical temperature gradient is that of a standard atmosphere, what will the temperature be at the summit of a mountain, 2500 metres above sea level?

+4°C

0°C

-2°C

+2°C

#20. The temperature at FL 140 is -12°C. What will the temperature be at FL 110 if the ICAO standard lapse rate is applied?

-15°C.

-6°C.

-18°C.

-9°C.

#21. If you are flying at FL 120 and the outside temperature is -2°C, at what altitude will the “freezing level” be?

FL 150

FL 90

FL 110

FL 130

#22. The troposphere:

reaches the same height at all latitudes

has a greater vertical extent above the equator than above the poles

contains all oxygen of the stratosphere

is the separation layer between the stratosphere and atmosphere

#23. The thickness of the troposphere varies with:

rotation of the earth

the wind

latitude

longitude

#24. What, approximately, is the average height of the tropopause over the equator?

16 km

8 km

11 km

40 km

#25. Going from the equator to the North Pole, the altitude of the tropopause

decreases and its temperature increases

increases and its temperature increases

increases and its temperature decreases

decreases and its temperature decreases

#26. The temperature at 10,000 FT in the International Standard Atmosphere is :

-20°C

-35°C

-5°C

0°C

#27. The average height of the tropopause at 50°N is about:

14 km

16 km

11 km

8 km

#28. In the lower part of the stratosphere the temperature

increases with altitude

increases at first and decreases afterward

is almost constant

decreases with altitude

#29. Which layer of the atmosphere contains more than 90% of all water vapour?

Troposphere

Lower stratosphere

Upper stratosphere

Ionosphere

#30. In the mid-latitudes the stratosphere extends on an average from:

85 to more than 200 km

11 to 50 km

0 to 11 km

50 to 85 km

#31. Which one of the following statements applies to the tropopause?

It is, by definition, an isothermal layer

It indicates a strong temperature lapse rate

It is, by definition, a temperature inversion

It separates the troposphere from the stratosphere

#32. At a certain position, the temperature on the 300 hPa chart is -48°C; according to the tropopause chart, the tropopause is at FL 330. What is the most likely temperature at FL 350?

-54°C

-50°C

-56°C

-58°C

#33. The tropopause is lower

south of the equator than north of it

over the equator than over the South Pole

over the North Pole than over the equator

in summer than winter in moderate latitudes

#34. What is the most likely temperature at the tropical tropopause?

-55°

-35°

-25°

-75°

#35. Which statement is correct regarding the International Standard Atmosphere?

At MSL temperature is 15°C and the decrease in temperature with height is 1°C per 100m

At MSL temperature is 10°C and the decrease in temperature with height is 1°C per 100m

At MSL pressure is 1013.25 hPa and the decrease of temperature with height is 1°C per 100m

At MSL temperature is 15°C and pressure is 1013.25hPa

#36. The tropopause is a level at which

water vapour content is greatest

pressure remains constant

vertical currents are strongest

temperature ceases to fall with increasing height

#37. The 0°C isotherm is forecast to be at FL 50. At what FL would you expect a temperature of -6°C?

FL80

FL20

FL100

FL110

Dgca Question Bank For Pilots

Results

#1. How does temperature vary with increasing altitude in the ICAO standard atmosphere below the tropopause?

#2. Which is true of the temperature at the tropopause?

#3. What is the boundary layer between troposphere and stratosphere called?

#4. How would you characterise an air temperature of -15°C at the 700 hPa level over Western Europe?

#5. The temperature at FL 110 is -5°C. What will the temperature be at FL 50 if the ICAO standard lapse rate is applied?

#6. How does the height of the tropopause normally vary with latitude in the northern hemisphere?

#7. The temperature at FL 80 is +6°C. What will the temperature be at FL 130 if the ICAO standard lapse rate is applied?

#8. The lowest assumed temperature in the ICAO Standard Atmosphere is :

#9. The troposphere is the:

#10. How would you characterise an air temperature of -55°C at the 200 hPa level over Western Europe?

#11. The height and the temperature of the tropopause are respectively in the order of

#12. What of the following is the most important constituent in the atmosphere from a weather stand-point?

#13. What is the vertical temperature lapse rate, up to 11 km, in the ICAO standard atmosphere?

#14. An outside air temperature of -35°C is measured while cruising at FL 200. What is the temperature deviation from the ISA at this level?

#15. How would you characterise an air temperature of -30°C at the 300 hPa level over Western Europe?

#16. The rate of decrease of temperature with height per 100 m in the International Standard Atmosphere is:

#17. What is the approximate composition of the dry air by volume in the troposphere?

#18. If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?

#19. A temperature of +15°C is recorded at an altitude of 500 metres above sea level. If the vertical temperature gradient is that of a standard atmosphere, what will the temperature be at the summit of a mountain, 2500 metres above sea level?

#20. The temperature at FL 140 is -12°C. What will the temperature be at FL 110 if the ICAO standard lapse rate is applied?

#21. If you are flying at FL 120 and the outside temperature is -2°C, at what altitude will the “freezing level” be?

#22. The troposphere:

#23. The thickness of the troposphere varies with:

#24. What, approximately, is the average height of the tropopause over the equator?

#25. Going from the equator to the North Pole, the altitude of the tropopause

#26. The temperature at 10,000 FT in the International Standard Atmosphere is :

#27. The average height of the tropopause at 50°N is about:

#28. In the lower part of the stratosphere the temperature

#29. Which layer of the atmosphere contains more than 90% of all water vapour?

#30. In the mid-latitudes the stratosphere extends on an average from:

#31. Which one of the following statements applies to the tropopause?

#32. At a certain position, the temperature on the 300 hPa chart is -48°C; according to the tropopause chart, the tropopause is at FL 330. What is the most likely temperature at FL 350?

#33. The tropopause is lower

#34. What is the most likely temperature at the tropical tropopause?

#35. Which statement is correct regarding the International Standard Atmosphere?

#36. The tropopause is a level at which

#37. The 0°C isotherm is forecast to be at FL 50. At what FL would you expect a temperature of -6°C?