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