AS 121 EXAM 4 STUDY QUESTIONS AND ANSWERS 2025
The vast majority of clouds, weather, storms and temperature variances occur within - (ANSWER)The
troposphere
The average temperature decrease within the troposphere is - (ANSWER)2 degrees Celsius every 1000
feet of altitude
A major factor that causes the atmosphere to constantly move is - (ANSWER)Uneven heating of the
Earth's surface
Which way does Coriolis force deflect moving air in the Northern hemisphere? - (ANSWER)To the right
Why does the wind direction at the surface vary from the wind direction at 2000 feet? -
(ANSWER)Friction
What is standard sea level pressure and temperature in the International Standard Atmosphere (ISA)? -
(ANSWER)29.92 "Hg and 59 degrees F
Falling pressure generally indicates what kind of weather? - (ANSWER)Approaching bad weather
What happens to barometric pressure as altitude increases? - (ANSWER)Pressure decreases
What effect does altitude have on takeoff distance in an airplane? - (ANSWER)The higher the altitude
the longer the takeoff run
Which way does air flow? - (ANSWER)From high pressure to low pressure
Which way does air circulate around a high pressure area (Northern Hemisphere) - (ANSWER)Clockwise
Which of the following is true? - (ANSWER)Land heats up faster than water due to solar energy
, AS 121 EXAM 4 STUDY QUESTIONS AND ANSWERS 2025
A pilot can expect the following when encountering wind shear that produces a change in wind direction
from a headwind to a tailwind. - (ANSWER)A decrease in airspeed and performance
The most severe type of low-level wind shear (microburst) is associated with what kind of weather? -
(ANSWER)Convective precipitation
Which of the following produces a "sea breeze"? - (ANSWER)Warm air over land rises, cool air over
water descends causing air to move from over the water toward the shore
What are the three stages of a thunderstorm? - (ANSWER)Cumulus, mature, dissipating
What is the most violent stage of a thunderstorm? - (ANSWER)Mature
Severe thunderstorms should be circumnavigated by how many miles? - (ANSWER)At least 20 nautical
miles
What 3 conditions must be present for a thunderstorm to form? - (ANSWER)Air must have sufficient
water vapor, an unstable lapse rate and an initial lifting action
Air mass thunderstorms are generally a result of - (ANSWER)Surface heating
Steady state thunderstorms are generally associated with which of the following? - (ANSWER)Weather
systems
What is the single most intense weather hazard to aircraft? - (ANSWER)Squall lines
What is the almost certain outcome of a pilot entering a tornado vortex? - (ANSWER)Loss of control and
aircraft structural damage
The vast majority of clouds, weather, storms and temperature variances occur within - (ANSWER)The
troposphere
The average temperature decrease within the troposphere is - (ANSWER)2 degrees Celsius every 1000
feet of altitude
A major factor that causes the atmosphere to constantly move is - (ANSWER)Uneven heating of the
Earth's surface
Which way does Coriolis force deflect moving air in the Northern hemisphere? - (ANSWER)To the right
Why does the wind direction at the surface vary from the wind direction at 2000 feet? -
(ANSWER)Friction
What is standard sea level pressure and temperature in the International Standard Atmosphere (ISA)? -
(ANSWER)29.92 "Hg and 59 degrees F
Falling pressure generally indicates what kind of weather? - (ANSWER)Approaching bad weather
What happens to barometric pressure as altitude increases? - (ANSWER)Pressure decreases
What effect does altitude have on takeoff distance in an airplane? - (ANSWER)The higher the altitude
the longer the takeoff run
Which way does air flow? - (ANSWER)From high pressure to low pressure
Which way does air circulate around a high pressure area (Northern Hemisphere) - (ANSWER)Clockwise
Which of the following is true? - (ANSWER)Land heats up faster than water due to solar energy
, AS 121 EXAM 4 STUDY QUESTIONS AND ANSWERS 2025
A pilot can expect the following when encountering wind shear that produces a change in wind direction
from a headwind to a tailwind. - (ANSWER)A decrease in airspeed and performance
The most severe type of low-level wind shear (microburst) is associated with what kind of weather? -
(ANSWER)Convective precipitation
Which of the following produces a "sea breeze"? - (ANSWER)Warm air over land rises, cool air over
water descends causing air to move from over the water toward the shore
What are the three stages of a thunderstorm? - (ANSWER)Cumulus, mature, dissipating
What is the most violent stage of a thunderstorm? - (ANSWER)Mature
Severe thunderstorms should be circumnavigated by how many miles? - (ANSWER)At least 20 nautical
miles
What 3 conditions must be present for a thunderstorm to form? - (ANSWER)Air must have sufficient
water vapor, an unstable lapse rate and an initial lifting action
Air mass thunderstorms are generally a result of - (ANSWER)Surface heating
Steady state thunderstorms are generally associated with which of the following? - (ANSWER)Weather
systems
What is the single most intense weather hazard to aircraft? - (ANSWER)Squall lines
What is the almost certain outcome of a pilot entering a tornado vortex? - (ANSWER)Loss of control and
aircraft structural damage
