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Worksheetsmet 1
Total questions: 40
Worksheet time: 21mins
What, approximately, is the average height of the tropopause over the Equator?
8 km
16 km
11 km
50 km
What is the boundary between the troposphere and the stratosphere called?
Ionosphere
Stratosphere
Atmosphere
Tropopause
How does the height of the tropopause normally vary with lattitude in the Northern Hemisphere?
It decreases from south to north
It increases from south to north
It remains constant from north to south
It remains constant throughout the year.
The temperature at FL110 is -12°C. What will the temperature be at FL140 if the ICAO standard lapse rate is applied?
-6°C
-18 c
-9°C
-15°C
Atmosphere is heated by____
Solar radiation
none
From above.
Heat from earth surface.
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.
Tropopause is discontinuous at about
30°lat
40°lat
80°lat
None
In the International Standard Atmosphere the decrease in temperature with height below 11 km is:
0.5°C/100 m
0.6°C/100 m
0.65°C/100 m
1°C/100 m
Mother of Pearl clouds occur in………….
Mesosphere
Thermosphere
Stratosphere
None
The 200 hPa pressure altitude level can vary in height. In temperate regions which of the following average heights is applicable?
FL390
FL300
FL100
FL50
The temperature in ISA at 17 km is
-56.5°C
-65.5° C
-35.5° C
By weight, approximate ratio of O2 to Na in the atmosphere is ..........
1:3
1:4
1:5
3:1
Which constant pressure altitude chart is standard for 4781ft pressure level (FL50)?
500 hPa
300 hPa
850 hPa
700 hPa
Most of atmospheric mass is contained in .
Troposphere
Stratosphere
Heterosphere
None
Additional oxygen is needed while flying above
5000ft
7000 ft
10,000 ft
12,000 ft
By volume, the proportion of CO2 in the atmosphere is…….
3%
0.3%
0.03%
None
An outside air temperature of -30°C is measured whilst cruising at FL200. What is the temperature deviation from the ISA at this level?
5°C colder than ISA
5°C warmer than ISA
10°C colder than ISA
10°C warmer than ISA
What is the most likely temperature at the tropical tropopause?
-56.5°C
-75°C
-40°С
-25°C
By volume, the approximate ratio of O2 to N2 in the atmosphere is .
1:3
1:4
4:1
1:5
In ISA, the mean sea level temperature is
15° C
10° C
25° C
none
In the lower part of the stratosphere the temperature:
is almost constant.
decreases with altitude
increases with altitude.
increases at first and decreases afterwards.
What is the approximate composition of the dry air by volume in the troposphere?
10% oxygen, 89% nitrogen and the rest other gases
88% oxygen, 9% nitrogen and the rest other gases
50% oxygen, 40% nitrogen and the rest other gases
21% oxygen, 78% nitrogen and the rest other gases
How does temperature vary with increasing altitude in the ICAO standard atmosphere below the tropopause?
Remains constant.
Decreases
Increases
At first it increases and higher up it decreases
Noctilucent clouds occur in
Thermosphere
Mesosphere
Stratosphere
none
Temperature at 2 km is 05°C what is ISA deviation?
(a)
In actual atmosphere temp. at 19 km is -60°C. Find the ISA deviation?
4.5°C
-05.5° C
-03.5°C
If you are flying at FL300 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
In ISA atmosphere the tropopause occurs at a height of
8-10 km
11km
16-18 km
16-16.5 km
Half of the atmospheric air mass is contained……. below
20,000 `
15,000 `
10,000 `
10,000 `
In jet standard atmosphere the Lapse Rate is
2°C/1000 `
2°C/km
5°C/km
In actual atmosphere the lapse rate could
Assume any value.
falls up to 8 km.
Rise up to 50 km
None
What is the most important constituent in the atmosphere from a wealth standpoint?
Carbon dioxide
Oxygen
Water vapour
Methane
Most of the transfer of heat in the atmosphere is due to
Conduction and freezing
convection and evaporation
Condensation, sublimation and freezing.
sublimation and radiation
Between mean sea level and a height of 20 km the lowest temperature in the international standard atmosphere (ISA) is:
(a)
One of the characteristics of our atmosphere is
Poor conductor of heat and electricity
Equator is warmer than poles above 10 km
Lapse rate in the stratosphere is positive.
Density is constant above 8 km
The knowledge of the height of tropopause is important for a pilot because.
weather is mainly confined up to this level.
clouds rarely reach up to this height due to Jetstream.
stratosphere starts at this height where all solar radiation are absorbed
A temperature of +15°C is recorded at an altitude of 500 metres above mean sea level. If the vertucal temperature gradient is that of a standard atmosphere, what will be the temperature at the summit of a mountain 2500 metres above mean sea level?
0°C
+2°C
+4°C
2°C
In ICAO ISA the atmosphere is assumed to be isothermal
in stratosphere
11 to 16 km
11 to 20 km
11 to 32 km
In the mid-latitudes the stratosphere extends on average from:
0 to 11 km
11 to 50 km
50 to 85 km
11 to 20 km
Tropical Tropopause extends from the equator to Lat. 35°-40°.Over India it is at
20-21 km
14-15 km
16-16.5 km
