Vayudoot Aviation

1. What is the most likely temperature at the tropical tropopause?

-25°

-75°

-55°

-35°

2. The troposphere is the

part of the atmosphere below the tropopause

part of the atmosphere above the stratosphere

boundary between the stratosphere and the mesosphere

boundary between the mesosphere and thermosphere

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

Ionosphere

Atmosphere

Tropopause

Stratosphere

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

Oxygen

Nitrogen

Hydrogen

Water vapour

5. In the lower part of the stratosphere the temperature

decreases with altitude

is almost constant

increases at first and decreases afterward

increases with altitude

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

FL 130

FL 90

FL 110

FL 150

7. 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?

-56°C

-50°C

-54°C

-58°C

8. The troposphere

reaches the same height at all latitudes

is the separation layer between the stratosphere and atmosphere

contains all oxygen of the stratosphere

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

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

Very low

Within +/-5°C of ISA

High

Low

10. The thickness of the troposphere varies with

rotation of the earth

latitude

longitude

the wind

11. 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

12. Which one of the following statements applies to the tropopause?

It is, by definition, an isothermal layer

It is, by definition, a temperature inversion

It indicates a strong temperature lapse rate

It separates the troposphere from the stratosphere

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

Ionosphere

Troposphere

Lower stratosphere

Upper stratosphere

14. The temperature at 10,000 FT in the International Standard Atmosphere is

0°C

-20°C

-5°C

-35°C

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

increases and its temperature decreases

increases and its temperature increases

decreases and its temperature increases

decreases and its temperature decreases

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

Decreases

At first it increases and higher up it decreases

Remains constant

Increases

17. Which statement is correct regarding the International Standard Atmosphere?

At MSL pressure is 1013.25 hPa and the decrease of 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 temperature is 15°C and the decrease in temperature with height is 1°C per 100m

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

18. 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?

5°C warmer than ISA

10°C colder than ISA

5°C colder than ISA

10°C warmer than ISA

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

16 km and -75°C over the equator

16 km and -40°C over the poles

8 km and - 75°C over the poles

8 km and -40°C over the equator

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

20°C below standard

Low

Within +/-5°C of ISA

High

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

6.5°C per 1000 m

3°C per 1000 m

2°C per 1000 m

4.5°C per 1000 m

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

-6°C.

-9°C.

-15°C.

-18°C.

23. 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

24. The tropopause is lower

south of the equator than north of it

over the North Pole than over the equator

in summer than winter in moderate latitudes

over the equator than over the South Pole

25. 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?

0°C

+4°C

+2°C

-2°C

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

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

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

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

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

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

11 km

16 km

8 km

14 km

28. The lowest assumed temperature in the ICAO Standard Atmosphere is

-273°C

-56.5°C

-100°C

-44.7°C

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

40 km

16 km

8 km

11 km

30. 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?

-60°C

-45°C

-30°C

-15°C

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

Within +/-5°C of ISA

Low

Very high

High

32. Which is true of the temperature at the tropopause?

It is highest in middle latitudes

There is no significant difference with change of latitude

It is higher in equatorial regions than in Polar Regions

It is higher in polar regions than in equatorial regions

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

FL100

FL80

FL110

FL20

34. In the mid-latitudes the stratosphere extends on an average from

11 to 50 km

85 to more than 200 km

50 to 85 km

0 to 11 km

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

0°C

-6°C

+2°C

-4°C

36. 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

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

It decreases from south to north

It remains constant throughout the year

It remains constant from north to south

It increases from south to north

Question Bank

Questions for ATMOSPHERE 1