ATC BASICS BLOCK 4 QUESTIONS &
ANSWERS|| 2025 LATEST UPDATE
Five layers of Earths Atmosphere in order? - ANSWER Troposphere, Stratosphere,
Mesosphere, Thermosphere, Exosphere
What level in the earths atmosphere contains almost all clouds and Precipitation? -
ANSWER Troposphere
An Increase in Temperature with altitude is abnormal and is defined as what? -
ANSWER Inversion
Average vertical depth of the Troposphere? - ANSWER 36,000 ft
Troposphere vertical depth at Equator, 50º N and S latitude, At poles? - ANSWER
65,000, 30,000, 20,000
The Stratosphere extends from where to where? - ANSWER From the Troposphere up
to 31 Miles AGL
Hypothetical vertical distribution of the atmospheric temperature, pressure, and density?
- ANSWER Standard Atmosphere
What is Standard atmosphere used for? - ANSWER Altimeter calibrations,
Performance Calculations, design, weather
Standard sea level Pressure - ANSWER 29.92 inches of mercury
Standard Sea level temp - ANSWER 15ºC/59ºF
Lapse rate - ANSWER 2Cº 3.5º per 1,000 feet
A migrating stream of high speed winds present at high altitudes? - ANSWER Jet
Stream
Two Jet streams? - ANSWER Polar and Subtropical
Polar and subtropical streams are located where? - ANSWER Polar 30º and 60º lat,
Subtropical 20º and 40º Lat
Jet stream flows which direction? and shifts? - ANSWER flows west to east, shifts north
and south due to weather and seasons
Jet streams often produce? - ANSWER Clear Air Turbulence (CAT)
, Jet Streams cause aircraft to move at? - ANSWER different ground speeds
What layer of the atmosphere is stable and devoid of significant weather? - ANSWER
Stratosphere
Water vapor is? - ANSWER Gas form of water
Evaporation is? - ANSWER When liquid is changed to a vapor
Sublimation? - ANSWER When a solid is changed to a gas without the passing through
the water phase
Raw material for clouds and precipitation? - ANSWER Water vapor
Where is half of the water vapor found? - ANSWER below 6,500 AGL
Temperature depends directly on? - ANSWER Energy of molecular motion
Air's capacity to hold water vapor is directly related to its? - ANSWER Temperature
What can hold more water vapor, Warm or cold air? - ANSWER Warm
Maximum possible quantity of water vapor that a particle of air can hold at any given
temperature and pressure? - ANSWER Saturation
Saturated means? - ANSWER an air particle contains all the water vapor it can hold
Unsaturated means? - ANSWER Air particle has the capacity to hold more
Higher dew points at a location generally indicate? - ANSWER Higher quantities of
water vapor
The ratio, usually expressed as a % of water vapor actually in the air parcel compared
to the amount of water vapor the air could hold at a particular temp and pressure? -
ANSWER Relative humidity
Relative humidity does not indicate the actual water vapor content of the air but? -
ANSWER how close the air is to saturation
Difference between air parcel's temp and dew point is? - ANSWER spread
When the temperature-dew point spread decreases what happens? and what happens
when the spread is 0? - ANSWER Relative humidity increases/at zero condensation
will form dew or fog
ANSWERS|| 2025 LATEST UPDATE
Five layers of Earths Atmosphere in order? - ANSWER Troposphere, Stratosphere,
Mesosphere, Thermosphere, Exosphere
What level in the earths atmosphere contains almost all clouds and Precipitation? -
ANSWER Troposphere
An Increase in Temperature with altitude is abnormal and is defined as what? -
ANSWER Inversion
Average vertical depth of the Troposphere? - ANSWER 36,000 ft
Troposphere vertical depth at Equator, 50º N and S latitude, At poles? - ANSWER
65,000, 30,000, 20,000
The Stratosphere extends from where to where? - ANSWER From the Troposphere up
to 31 Miles AGL
Hypothetical vertical distribution of the atmospheric temperature, pressure, and density?
- ANSWER Standard Atmosphere
What is Standard atmosphere used for? - ANSWER Altimeter calibrations,
Performance Calculations, design, weather
Standard sea level Pressure - ANSWER 29.92 inches of mercury
Standard Sea level temp - ANSWER 15ºC/59ºF
Lapse rate - ANSWER 2Cº 3.5º per 1,000 feet
A migrating stream of high speed winds present at high altitudes? - ANSWER Jet
Stream
Two Jet streams? - ANSWER Polar and Subtropical
Polar and subtropical streams are located where? - ANSWER Polar 30º and 60º lat,
Subtropical 20º and 40º Lat
Jet stream flows which direction? and shifts? - ANSWER flows west to east, shifts north
and south due to weather and seasons
Jet streams often produce? - ANSWER Clear Air Turbulence (CAT)
, Jet Streams cause aircraft to move at? - ANSWER different ground speeds
What layer of the atmosphere is stable and devoid of significant weather? - ANSWER
Stratosphere
Water vapor is? - ANSWER Gas form of water
Evaporation is? - ANSWER When liquid is changed to a vapor
Sublimation? - ANSWER When a solid is changed to a gas without the passing through
the water phase
Raw material for clouds and precipitation? - ANSWER Water vapor
Where is half of the water vapor found? - ANSWER below 6,500 AGL
Temperature depends directly on? - ANSWER Energy of molecular motion
Air's capacity to hold water vapor is directly related to its? - ANSWER Temperature
What can hold more water vapor, Warm or cold air? - ANSWER Warm
Maximum possible quantity of water vapor that a particle of air can hold at any given
temperature and pressure? - ANSWER Saturation
Saturated means? - ANSWER an air particle contains all the water vapor it can hold
Unsaturated means? - ANSWER Air particle has the capacity to hold more
Higher dew points at a location generally indicate? - ANSWER Higher quantities of
water vapor
The ratio, usually expressed as a % of water vapor actually in the air parcel compared
to the amount of water vapor the air could hold at a particular temp and pressure? -
ANSWER Relative humidity
Relative humidity does not indicate the actual water vapor content of the air but? -
ANSWER how close the air is to saturation
Difference between air parcel's temp and dew point is? - ANSWER spread
When the temperature-dew point spread decreases what happens? and what happens
when the spread is 0? - ANSWER Relative humidity increases/at zero condensation
will form dew or fog
