MET Q1 - Atmosphere

Question 1

The temperature of the atmosphere below 20km
(select one)

A. Reduces with altitude then remains constant
B. Increases with altitude
C.Decreases with altitude
D.Remains constant

Answer 1

A. Reduces with altitude then remains constant

Question 1

The temperature at the tropopause
(select one)

A. Increases with latitude
B.Decreases from the equator to the poles
C.Is constant at all latitudes
D. Is -56.5°C

Answer 1

A. Increases with latitude

Question 2

Why does the temperature of the stratosphere increase with height?
(select one)

A.Due to the presence of ozone
B.It’s heated by the sun
C.Due to radiation from the earth’s surface
D.Due to the proximity to the mesosphere

Answer 2

A.Due to the presence of ozone

Question 3

In the Troposphere the decreases in pressure per 100m increase in height is
(select one)

A.Greater in the lower layers than in the higher layers
B.In the order of 27hPa per 100m in the friction layer
C.Always greater in a high pressure area than in a low pressure area
D.Greater than in the higher layers than in the lower layers

Answer 3

A.Greater in the lower layers than in the higher layers

Question 4

What is the temperature, pressure and density at mean sea level, in ISA conditions?

Answer 4

Temperature +15°C / 59°F / 288K
Density 1.225kg/m3
Pressure 1013Hpa / 29.92inHg / 760mmHg

Question 5

If you are descending from FL180 and the outside temperature is -12°C, at what level will you pass through the “freezing level”?
(select one)
A.FL120
B.FL060
C.FL150
D.FL080

Answer 5

Temperature will increase at a rate of 2°C per 1000ft reduction in altitude. From -12°C the atmosphere will warm as you descend so 6000ft lower the temperature will be 0°C. FL180 (18000ft) - 6000ft = FL120 (12000ft)
The correct answer is: FL120

Question 6

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

A.+7°C
B.+3°C
C.-3°C
D.0°C

Answer 6

The standard temperature lapse rate is 2°C per 1000ft of altitude. The difference between FL110 (11000ft) and FL050 (5000ft) is 6000ft. With -5°C at 11000ft, the temperature will increase by 12 degrees over 6000ft so at 5000ft we can assume the temperature will be +7°C.
The correct answer is: +7°C

Question 7

Which of the following can constitute a hazard when cruising above the tropopause?
(select one)

A.An increase in ozone levels
B.An increase in turbulence
C.Nacreous cloud
D.An increase in temperature

Answer 7

A.An increase in ozone levels

Question 8

What is the approximate composition of dry air by volume in the atmosphere?

(select one or more)

A.21% Oxygen, 78% Nitrogen and the rest other gases
B.10% Oxygen, 89% Nitrogen and the rest other gases
C.88% Oxygen, 9% Nitrogen and the rest other gases
D.50% Oxygen, 40% Nitrogen and the rest other gases

Answer 8

A.21% Oxygen, 78% Nitrogen and the rest other gases

Question 9

What is the vertical temperature lapse rate, up to 11 km, in the standard ICAO atmosphere?
(select one or more)

A.4.5°C per 1000 m
B.3°C per 1000 m
C.6.5°C per 1000 m
D.2°C per 1000 m

Answer 9

C.6.5°C per 1000 m

Equivalent to 0.65°C/100m and 2°C/1000ft