Vayudoot Aviation

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

-35°

-25°

-55°

-75°

2. 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

3. 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

-58°C

-50°C

-54°C

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

-4°C

0°C

+2°C

-6°C

5. In the lower part of the stratosphere the temperature

increases with altitude

increases at first and decreases afterward

decreases with altitude

is almost constant

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

It separates the troposphere from the stratosphere

It is, by definition, a temperature inversion

It is, by definition, an isothermal layer

It indicates a strong temperature lapse rate

7. 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.

-9°C.

-6°C.

-18°C.

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

Ionosphere

Lower stratosphere

Troposphere

Upper stratosphere

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

Within +/-5°C of ISA

High

Very high

Low

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

FL100

FL20

FL80

FL110

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

16 km and -75°C over the equator

8 km and - 75°C over the poles

16 km and -40°C over the poles

8 km and -40°C over the equator

12. 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?

-2°C

+4°C

+2°C

0°C

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

Water vapour

Nitrogen

Oxygen

Hydrogen

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

2°C per 1000 m

6.5°C per 1000 m

3°C per 1000 m

4.5°C per 1000 m

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

11 km

16 km

8 km

40 km

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

-35°C

-5°C

0°C

-20°C

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

It is higher in equatorial regions than in Polar Regions

There is no significant difference with change of latitude

It is highest in middle latitudes

It is higher in polar regions than in equatorial regions

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

Decreases

Remains constant

Increases

At first it increases and higher up it decreases

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

8 km

11 km

14 km

16 km

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

Tropopause

Atmosphere

Stratosphere

Ionosphere

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

-56.5°C

-273°C

-44.7°C

-100°C

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

decreases and its temperature increases

decreases and its temperature decreases

increases and its temperature decreases

increases and its temperature increases

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

Very low

High

Within +/-5°C of ISA

Low

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

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

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

25. 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

26. The thickness of the troposphere varies with

latitude

rotation of the earth

longitude

the wind

27. The troposphere is the

boundary between the stratosphere and the mesosphere

part of the atmosphere below the tropopause

part of the atmosphere above the stratosphere

boundary between the mesosphere and thermosphere

28. 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 colder than ISA

5°C colder than ISA

5°C warmer than ISA

10°C warmer than ISA

29. 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

+7°C

0°C

-3°C

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

50 to 85 km

0 to 11 km

85 to more than 200 km

11 to 50 km

31. 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

-15°C

-45°C

-30°C

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

0.65°C

variable

1°C

0.5°C

33. The tropopause is a level at which

pressure remains constant

temperature ceases to fall with increasing height

vertical currents are strongest

water vapour content is greatest

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

FL 90

FL 110

FL 130

FL 150

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

It decreases from south to north

It increases from south to north

It remains constant throughout the year

It remains constant from north to south

36. The tropopause is lower

over the equator than over the South Pole

in summer than winter in moderate latitudes

over the North Pole than over the equator

south of the equator than north of it

37. The troposphere

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

reaches the same height at all latitudes

contains all oxygen of the stratosphere

is the separation layer between the stratosphere and atmosphere

Question Bank

Questions for ATMOSPHERE 1