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Multiple Choice
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1

An airplane flying at 35,000 feet is above what percent of the earth's atmosphere?
A)50%
B)75%
C)90%
D)99%
2

Normal atmospheric pressure is enough to support a column of mercury approximately
A)29.9 cm high.
B)76.0 cm high.
C)101 cm high.
D)760 cm high.
3

Your ears "pop" when an unpressurized plane climbs higher because
A)air is moving from the outside into your eardrum.
B)air is moving from your eardrum to the outside.
C)the air pressure in the plane decreases.
D)the fluid in your Eustachian tubes exerts pressure on your eardrums.
4

Nearly 1400 watts/meter2 of solar energy reaches the outermost atmosphere of the earth. What fraction of this energy on average actually reaches the surface?
A)20%
B)33%
C)50%
D)67%
5

A psychrometer measures
A)atmospheric pressure.
B)altitude.
C)relative humidity.
D)ultraviolet light intensity.
6

The majority of the sun's radiation output occurs as
A)yellow light.
B)ultraviolet light.
C)infrared radiation.
D)gamma radiation.
7

The greenhouse effect results in warmer temperatures near the surface because
A)clouds trap infrared radiation near the surface.
B)some of the energy that would ordinarily escape is re-radiated toward the surface.
C)carbon dioxide and water vapor trap infrared radiation.
D)carbon dioxide molecules do not permit radiation to escape.
8

The interaction between ultraviolet light and ozone that protects life on the surface takes place in the
A)troposphere.
B)stratosphere.
C)exosphere.
D)ozonosphere.
9

On a clear, calm night, you would expect the air in the bottom of a valley to be
A)cooler than that on a hillside.
B)warmer than the air on a hillside.
C)less dense than that in surrounding areas.
D)the same temperature as that in surrounding areas.
10

Hot air rising from the equatorial regions eventually cools and descends to form
A)a belt of moist, low-pressure air.
B)a belt of dry, high-pressure air.
C)the jet stream.
D)a Chinook.





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