Large raindrops fall ____ smaller raindrops, and have ____ terminal velocity than/as small raindrops.
a. faster than; a lesser
b. faster than; a greater
c. slower than; a lesser
d. slower than;, a greater
e. at the same rate as; the same
Question 2Which cloud type below will only produce precipitation by the collision-coalescence process?
a. a thick, cold nimbostratus cloud
b. a thick, warm cumulus cloud
c. a thick, cold cumulus cloud
d. a thick, supercooled cumulonimbus cloud with abundant nuclei
e. a supercooled cumulus congestus cloud
Question 3Condensation onto hygroscopic nuclei is possible at relative humidities less than 100 percent due to the
a. curvature effect.
b. electrical charge on these nuclei.
c. solute effect.
d. crystalline structure of these nuclei.
e. size of the nuclei.
Question 4Which statement below best describes the curvature effect?
a. large cloud droplets fall faster than small droplets.
b. small droplets evaporate more quickly than large droplets.
c. small droplets collide and coalesce more easily than larger droplets.
d. it explains the six-sided shape of ice crystals.
e. it explains the shape of rain drops.
Question 5
Which below best describes the solute effect?
a. keeps water droplets from freezing at temperatures below 32F
b. removal of pollutants from the atmosphere by cloud droplets
c. water droplets dissolve hygroscopic nuclei and condensation can occur at relative humidities less than 100 percent
d. evaporation of cloud droplets and growing of ice crystals in a cold cloud
e. condensation occurs at relative humidities of 100 percent
Question 6A warm stratus cloud is typically less than 500 m thick and has slow upward air movement (generally less than 0.1 m/sec).
a. True
b. False
Question 7In calm air, a typical cloud droplet falls over 600 times faster than a typical raindrop.
a. True
b. False
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