Our Dynamic Weather
| Pre-class Quiz #6:
for on-Line Reading #6
| Dr. Dave
Dept. of Geosciences
SFSU, Fall 2012
This is a "preview" version of Pre-class Quiz #6, which is based on on-line Reading Assignment #6. The "preview"
version is suitable for printing and leisurely inspection before you submit
your answers to the the interactive or "live" version—that is,
the real thing. When you feel ready to submit your answers, go to iLearn's METR 104 "Pre-class Quizzes" section, select the interactive version,
and follow its instructions.
Responses must be submitted by 1:05 p.m. Wednesday, Nov. 28. (If you leave the interactive version before submitting your answers, you can save answers already entered by clicking on the "Save without submitting" button at the bottom of the quiz page, and you can return later. In any case, be sure to submit your responses by the deadline by clicking on the "Submit all and finish" button at the bottom of the quiz page.)
You will have two chances to get each question correct. (If you want to resubmit your answers, you will have to wait at least 10 minutes after the first submission.)
Description: The nine questions below (all are multiple choice) address points made about water vapor and clouds in On-line Reading Assignment #6.
(1) Multiple Choice. Changes of State or Phase of Water. Which of the following changes of state or phase of water adds water vapor to the air? (Select the one correct answer.)
(2) Multiple Choice. The Capacity of Air to Hold Water Vapor. There is an upper limit to the amount of water vapor that can be present in the air. When that limit is reached, we say that the air is saturated with water vapor because the air can't "hold" any more.
What determines the upper limit to, or the maximum amount of , water vapor that air can "hold"? (Choose the one [best] correct answer.)
(3) Multiple Choice. Relative Humidity. Humidity is a broad term referring to the amount of water vapor in the air. One particular, more specific measure of humidity is relative humidity. How is relative humidity defined? (Choose the one correct answer.)
(4) Multiple Choice. Relative Humidity: Dependence on Temperature. What happens to the relative humidity when air warms up (for example, inside a heated house or apartment on a cold winter day)?
(Assume that the actual amount of water vapor present in the air does not change by, say, evaporation of liquid water into it.) (Choose the one correct answer.)
(5) Multiple Choice: Dew Point Temperature. Humidity is a broad term referring to the amount of water vapor in the air. One particular, more specific measure of humidity is dew-point temperature, which is defined as the temperature to which air must be cooled to saturate it.
What determines the dew-point temperature of a "parcel" (small blob) of air? (Choose the one [best] correct answer.)
(6) Multiple Choice. Pressure Variation with Increasing Altitude. As you (or a rising "parcel" of air) go higher in the atmosphere, what happens to the atmospheric pressure on you (or the parcel)? (Choose the one correct answer.)
(7) Multiple Choice. Adiabatic Temperature Changes. What happens to the temperature of an air "parcel" when the pressure on the parcel decreases and (as a result) the parcel expands? (Choose the one correct answer.)
(8) Multiple Choice. Cloud Formation. What must happen for a cloud to form in the atmosphere? (Choose the one correct answer.)
(9) Multiple Choice. Clouds along Fronts. Why do clouds tend to form along fronts? (Choose the one best answer.)