Challenge Questions IFR Sec 1.

Question: 4089 Subject Code: I22
Under what condition is pressure altitude and density altitude the same value?
A) When indicated, and pressure altitudes are the same value on the altimeter.
B) At standard temperature.
C) When the altimeter setting is 29.92" Hg.

Question: 4090 Subject Code: I22
Under which condition will pressure altitude be equal to true altitude?
A) When standard atmospheric conditions exist.
B) When indicated altitude is equal to the pressure altitude.
C) When the atmospheric pressure is 29.92" Hg.

Question: 4091 Subject Code: I22
Which condition would cause the altimeter to indicate a lower altitude than actually flown (true altitude)?
A) Air temperature lower than standard.
B) Atmospheric pressure lower than standard.
C) Air temperature warmer than standard.

Question: 4093 Subject Code: I22
When an altimeter is changed from 30.11" Hg to 29.96" Hg, in which direction will the indicated altitude change and by what value?
A) Altimeter will indicate 15 feet lower.
B) Altimeter will indicate 150 feet lower.
C) Altimeter will indicate 150 feet higher.

Question: 4094 Subject Code: I21
A common type of ground or surface based temperature inversion is that which is produced by
A) warm air being lifted rapidly aloft in the vicinity of mountainous terrain.
B) ground radiation on clear, cool nights when the wind is light.
C) the movement of colder air over warm air, or the movement of warm air under cold air.

Question: 4095 Subject Code: I21
How much colder than standard temperature is the actual temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperature Aloft Forecast?

FT 6000 9000
0737-04 1043-10

A) 7 °C.
B) 10 °C.
C) 3 °C.
Question: 4096 Subject Code: I21
The primary cause of all changes in the Earth's weather is
A) variation of solar energy received by the Earth's regions.
B) movement of the air masses.
C) changes in air pressure over the Earth's surface.

Question: 4097 Subject Code: I20
A characteristic of the stratosphere is
A) relatively small changes in temperature with an increase in altitude.
B) a relatively even base altitude of approximately 35,000 feet.
C) an overall decrease of temperature with an increase in altitude.

Question: 4099 Subject Code: I24
The presence of ice pellets at the surface is evidence that
A) there is freezing rain at a higher altitude.
B) there are thunderstorms in the area.
C) a cold front has passed.

Question: 4101 Subject Code: I24
To which meteorological condition does the term ``dewpoint'' refer?
A) The temperature to which air must be cooled to become saturated.
B) The temperature at which dew will always form.
C) The temperature at which condensation and evaporation are equal.

Question: 4102 Subject Code: I24
What temperature condition is indicated if wet snow is encountered at your flight altitude?
A) You are flying from a warm air mass into a cold air mass.
B) The temperature is above freezing at your altitude.
C) The temperature is below freezing at your altitude.

Question: 4103 Subject Code: I24
The amount of water vapor which air can hold largely depends on
A) air temperature.
B) stability of air.
C) relative humidity.

Question: 4104 Subject Code: I24
Clouds, fog, or dew will always form when
A) water vapor is present.
B) the temperature and dewpoint are equal.
C) water vapor condenses.

Question: 4105 Subject Code: I23
What causes surface winds to flow across the isobars at an angle rather than parallel to the isobars?
A) Surface friction.
B) The greater density of the air at the surface.
C) Coriolis force.

Question: 4106 Subject Code: I23
Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to
A) friction between the wind and the surface.
B) a stronger pressure gradient at higher altitudes.
C) stronger Coriolis force at the surface.

Question: 4107 Subject Code: I23
What relationship exists between the winds at 2,000 feet above the surface and the surface winds?
A) The surface winds tend to veer to the right of the winds at 2,000 feet and are usually weaker.
B) The winds at 2,000 feet and the surface winds flow in the same direction, but the surface winds are weaker due to friction.
C) The winds at 2,000 feet tend to parallel the isobars while the surface winds cross the isobars at an angle toward lower pressure and are weaker.

Question: 4108 Subject Code: I23
Which force, in the Northern Hemisphere, acts at a right angle to the wind and deflects it to the right until parallel to the isobars?
A) Pressure gradient.
B) Centrifugal.
C) Coriolis.

Question: 4109 Subject Code: I22
Under what condition will true altitude be lower than indicated altitude with an altimeter setting of 29.92" Hg?
A) In warmer than standard air temperature.
B) When density altitude is higher than indicated altitude.
C) In colder than standard air temperature.

Question: 4110 Subject Code: I22
Which of the following defines the type of altitude used when maintaining FL 210?
A) Pressure.
B) Indicated.
C) Calibrated.

Question: 4111 Subject Code: I22
Altimeter setting is the value to which the scale of the pressure altimeter is set so the altimeter indicates
A) true altitude at field elevation.
B) pressure altitude at sea level.
C) pressure altitude at field elevation.

Question: 4112 Subject Code: I21
The most frequent type of ground or surface based temperature inversion is that produced by
A) the movement of colder air under warm air, or the movement of warm air over cold air.
B) radiation on a clear, relatively still night.
C) warm air being lifted rapidly aloft in the vicinity of mountainous terrain.

Question: 4113 Subject Code: I21
If the air temperature is +8 °C at an elevation of 1,350 feet and a standard (average) temperature lapse rate exists, what will be the approximate freezing level?
A) 9,350 feet MSL.
B) 3,350 feet MSL.
C) 5,350 feet MSL.

Question: 4114 Subject Code: I21
What feature is associated with a temperature inversion?
A) Air mass thunderstorms.
B) An unstable layer of air.
C) A stable layer of air.

Question: 4125 Subject Code: I21
A temperature inversion will normally form only
A) in unstable air.
B) in stable air.
C) when a stratiform layer merges with a cumuliform mass.

Question: 4154 Subject Code: I20
The average height of the troposphere in the middle latitudes is
A) 25,000 feet.
B) 20,000 feet.
C) 37,000 feet.

Question: 4159 Subject Code: I24
What enhances the growth rate of precipitation?
A) Cyclonic movement.
B) Upward currents.
C) Advective action.

Question: 4161 Subject Code: I24
Which precipitation type normally indicates freezing rain at higher altitudes?
A) Snow.
B) Hail.
C) Ice pellets.

Question: 4200 Subject Code: I21
Which weather conditions should be expected beneath a low level temperature inversion layer when the relative humidity is high?
A) Light wind shear and poor visibility due to haze and light rain.
B) Smooth air and poor visibility due to fog, haze, or low clouds.
C) Turbulent air and poor visibility due to fog, low stratus type clouds, and showery precipitation.

Question: 4227 Subject Code: I20
Which feature is associated with the tropopause?
A) Absolute upper limit of cloud formation.
B) Abrupt change in temperature lapse rate.
C) Absence of wind and turbulent conditions.

Question: 4238 Subject Code: I23
Hazardous wind shear is commonly encountered near the ground
A) during periods when the wind velocity is stronger than 35 knots.
B) during periods when the wind velocity is stronger than 35 knots and near mountain valleys.
C) during periods of strong temperature inversion and near thunderstorms.