Instrument Written Test Questions.txt

4097. A characteristic of the stratosphere is
A. An overall decrease of temperature with an increase in altitude.
B. Relatively small changes in temperature with an increase in altitude.
C. a relatively even base altitude of approximately 35,000 feet.

4154. The average height of the troposphere in the middle latitude is
A. 20,000 feet
B. 25,000 feet
C. 37,000 feet

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

4155. A jet stream is defined as wind of
A. 40 knots or greater
B. 30 knots or greater
C. 50 knots or greater

4168. The strength and location of the jet stream is normally
A. weaker and farther north in the summer
B. Stronger and further north in the summer
C. Stronger and farther north in the winter

4096. The primary cause of all changes in the earth's weather is
A. changes in air pressure over the Earth's surface
B. Movement of the air masses.
C. Variation of solar energy received by the Earth's regions

4095. How much colder than standard temperature is the forecast temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperatures Aloft Forecast.
FT. 6000 9000
0737-04. 1043-10
A. 10*C
B. 7*C
C. 3*C

4113. 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. 3,350 feet MSL
B. 5,350 feet MSL
C. 9,350 feet MSL

4094. 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. the movement of colder air over warm air, or the movement of warm air under cold air
C. ground radiation on clear, cool nights when the wind is light

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

4114. What feature is associated with a temperature inversion?
A. Air mass thunderstorms
B. A stable layer of air
C. an unstable layer of air

4125. 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

4200. 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. Turbulent air and poor visibility due to fog, low stratus-type clouds, and showery precipitation
C. Smooth air and poor visibility due to fog, haze, or low clouds

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

4106. 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. Stronger Coriolis force at the surface
B. friction between the wind and the surface
C. A stronger pressure gradient at higher altitudes

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

4108. 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. Coriolis
B. Pressure gradient
C. Centrifugal