Peralta Community College District
Physical Geography
Rita D. Haberlin, Instructor

Moisture in the Atmosphere Quiz

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Important:   When you answer a question, a response box will appear.   You must close this response box before continuing the quiz.  There are 15 questions in this quiz.
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1. The feathery, wispy clouds that form at the highest altitudes are:

Cumulus
Cirrus
Stratus
Alto
Nimbo
2. Which cloud sometimes produces thunder and lightning?
Cirrostratus
Cirrus
Altostratus
Cumulonimbus
Nimbostratus
All of the above
3. Dew point is the temperature at which:
Water vapor condenses into a liquid
Hailstones are formed
Water in the liquid state changes into water vapor
Clouds produce rain
4. What is relative humidity?
The relative difference between saturation point and the temperature of the air
The temperature at which the air is saturated
The ratio of the air's water vapor content relative to its water vapor capacity
5. Relative humidity is typically highest at:
Early Evening
Sunrise
Late Afternoon
Midnight
6. What are the conditions that favor the formation of radiation fog?
Warm, cloudy, calm nights
Warm, cloudy, windy nights
Cool, cloudy, windy nights
Cool, clear, calm nights
7. Why do rising parcels of air become colder with altitude?
The parcels reach colder air
Expansion of gases causes cooling
Compression of gases causes cooling
Water vapor condenses
8. What is specific humidity?
The number of grams of water vapor per kilogram of air
The ratio of the amount of air compared to the amount that could be held if the air were saturated
The ratio of the weight of water vapor to the weight of the air without water vapor
9. Why does a rain shadow occur in the lee (leeward) side of a mountain range?
No water vapor is left in the air.
Air is forced to rise and is warmed by the adiabatic process.
Condensation has a drying effect on the air.
As air descends, adiabatic warming causes clouds to evaporate.
10. Which one of the following is NOT a process that lifts air and causes adiabatic cooling?
Convection
Advection
Orographic lifting
Frontal lifting
11. When does frontal precipitation occur?
When cold air is in contact with the ground.
During the passage of a cold air mass.
When air masses of contrasting temperatures and moistures meet.
When air rises above heated ground.
12. What kind of fog is typical of the Central Valley in California on cold, clear, calm nights in winter?
Radiation
Advection
Upslope
Steam
13. Which one of the following cooling processes is responsible for San Francisco Bay Area coastal fog in summer?
Radiation
Adiabatic
Advection
Convection
14. Which one of the following is essential before clouds can form (condensation)?
There must be water vapor in the atmosphere.
There must be a cooling process.
There must be condensation nuclei in the atmosphere.
All of the above are essential
15. Both temperature and humidity can be measured using a:
Thermometer
Seismograph
Sling psychrometer
Barometer

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