AS 121 Exam 4 STUDY GUIDE ACTUAL
QUESTIONS AND CORRECT ANSWERS
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
Which way does Coriolis force deflect moving air in the Northern hemisphere? - CORRECT
ANSWER To the right
Which way does air circulate around a high pressure area (Northern Hemisphere) - CORRECT
ANSWER Clockwise
Why does the wind direction at the surface vary from the wind direction at 2000 feet? - CORRECT
ANSWER Friction
The average temperature decrease within the troposphere is - CORRECT ANSWER 2 degrees
Celsius every 1000 feet of altitude
Falling pressure generally indicates what kind of weather? - CORRECT ANSWER
Approaching bad weather
The vast majority of clouds, weather, storms and temperature variances occur within - CORRECT
ANSWER The troposphere
The most severe type of low-level wind shear (microburst) is associated with what kind of weather? -
CORRECT ANSWER Convective precipitation
Land heats up faster than water due to solar energy, true or false - CORRECT ANSWER True
What happens to barometric pressure as altitude increases? - CORRECT ANSWER Pressure
decreases
Which way does air flow? - CORRECT ANSWER From high pressure to low pressure
, What effect does altitude have on takeoff distance in an airplane? - CORRECT ANSWER The
higher the altitude the longer the takeoff run
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
What is standard sea level pressure and temperature in the International Standard Atmosphere (ISA)?
- CORRECT ANSWER 29.92 "Hg and 59 degrees F
A major factor that causes the atmosphere to constantly move is - CORRECT ANSWER
Uneven heating of the Earth's surface
Weather is caused by - CORRECT ANSWER Uneven heating of the Earth's surface
An INCREASE of altitude WILL - CORRECT ANSWER INCREASE takeoff distance (all
other things being equal)
2 degrees C per 1000' of altitude - CORRECT ANSWER Standard TEMPERATURE lapse rate
1" Hg per 1000' of altitude - CORRECT ANSWER Standard PRESSURE lapse rate (up to
10k')
Isobars - CORRECT ANSWER Lines of equal pressure
Aileron - CORRECT ANSWER On the backside of the wing
Every physical process of weather is accompanied by, or is the result of, a - CORRECT ANSWER
heat exchange.
Convective circulation patterns associated with sea breezes are caused by - CORRECT ANSWER
cool, dense air moving inland from over the water.
QUESTIONS AND CORRECT ANSWERS
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
Which way does Coriolis force deflect moving air in the Northern hemisphere? - CORRECT
ANSWER To the right
Which way does air circulate around a high pressure area (Northern Hemisphere) - CORRECT
ANSWER Clockwise
Why does the wind direction at the surface vary from the wind direction at 2000 feet? - CORRECT
ANSWER Friction
The average temperature decrease within the troposphere is - CORRECT ANSWER 2 degrees
Celsius every 1000 feet of altitude
Falling pressure generally indicates what kind of weather? - CORRECT ANSWER
Approaching bad weather
The vast majority of clouds, weather, storms and temperature variances occur within - CORRECT
ANSWER The troposphere
The most severe type of low-level wind shear (microburst) is associated with what kind of weather? -
CORRECT ANSWER Convective precipitation
Land heats up faster than water due to solar energy, true or false - CORRECT ANSWER True
What happens to barometric pressure as altitude increases? - CORRECT ANSWER Pressure
decreases
Which way does air flow? - CORRECT ANSWER From high pressure to low pressure
, What effect does altitude have on takeoff distance in an airplane? - CORRECT ANSWER The
higher the altitude the longer the takeoff run
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
What is standard sea level pressure and temperature in the International Standard Atmosphere (ISA)?
- CORRECT ANSWER 29.92 "Hg and 59 degrees F
A major factor that causes the atmosphere to constantly move is - CORRECT ANSWER
Uneven heating of the Earth's surface
Weather is caused by - CORRECT ANSWER Uneven heating of the Earth's surface
An INCREASE of altitude WILL - CORRECT ANSWER INCREASE takeoff distance (all
other things being equal)
2 degrees C per 1000' of altitude - CORRECT ANSWER Standard TEMPERATURE lapse rate
1" Hg per 1000' of altitude - CORRECT ANSWER Standard PRESSURE lapse rate (up to
10k')
Isobars - CORRECT ANSWER Lines of equal pressure
Aileron - CORRECT ANSWER On the backside of the wing
Every physical process of weather is accompanied by, or is the result of, a - CORRECT ANSWER
heat exchange.
Convective circulation patterns associated with sea breezes are caused by - CORRECT ANSWER
cool, dense air moving inland from over the water.
