For Question 381 select "B", "C" or "D" ("A" is selected only as an example)!
381. What are characteristics of unstable air?
A) None of the below. B) Turbulence and good surface visibility. C) Turbulence and poor surface visibility. D) Nimbostratus clouds and good surface visiblity.
382. A stable air mass is most likely to have which characteristic?
A) Showery precipitation. B) Turbulent air. C) Poor surface visiblity. D) None of the above.
383. Moist, stable air flowing upslope can be expected to:
A) produce stratus type clouds. B) cause showers and thunderstroms. C) develop convective turbulence. D) None of the above.
384. What feature is associated with a temperature inversion?
A) A stable layer of air. B) An unstable layer of air. C) Chinook winds on mountain slopes. D) None of the above.
385. If an unstable air mass is forced upward, what type clouds can be expected?
A) Startus clouds with little vertical development. B) Stratus clouds with considerable associated turbulence. C) Clouds with considerable vertical develpoment and associated turbulence. D) None of the above.
386. What measurement can be used to determine the stability of the atmosphere?
A) Atmospheric pressure. B) Actual lapse rate. C) Surface temperature. D) None of the above.
387. What would decrease the stability of an air mass?
A) Warming from below. B) Cooling from below. C) Decrease in water vapor. D) None of the above.
388. What is a characteristic of stable air?
A) Stratiform clouds. B) Unlimited visibility. C) Cumulus clouds. D) None of the above.
389. Every physical process of weather is accompanied by, or is the result of, a:
A) movement of air. B) pressure differential. C) heat exchange. D) None of the above.
390. What causes variations in altimeter settings between weather reporting points?
A) Unequal heating of the Earth's surface. B) Variation of terrain elevation. C) Coriolis force. D) None of the above.