Weather

5 free sample questions of the 59 in this topic. The full set is in the app.

1. Question 1

   Tall, vertically developed cumulonimbus clouds are most commonly associated with:

   • A.Stable air and smooth flying conditions
   • B.Unstable air, turbulence, and thunderstorms
   • C.A temperature inversion
   • D.Fog
   Show answer & explanation

   Answer: B. Unstable air, turbulence, and thunderstorms

   Cumulonimbus clouds form in unstable atmospheres and are associated with thunderstorms, turbulence, hail, lightning, and icing.

2. Question 2

   Which set of conditions generally indicates a stable atmosphere?

   • A.Good visibility and stratiform clouds
   • B.Turbulent conditions and cumuliform clouds
   • C.Lifted index strongly negative
   • D.Warm surface air rising rapidly
   Show answer & explanation

   Answer: A. Good visibility and stratiform clouds

   Stable air resists vertical motion — expect stratiform clouds, poor visibility, and steady precipitation.

3. Question 3

   A temperature inversion near the surface most often causes:

   • A.Severe turbulence
   • B.Reduced visibility from trapped pollutants/haze
   • C.Strong updrafts
   • D.Towering cumulus
   Show answer & explanation

   Answer: B. Reduced visibility from trapped pollutants/haze

   Inversions cap the atmosphere, trapping moisture, smoke, and pollutants beneath — typically reducing visibility.

4. Question 4

   The minimum distance a sUAS must remain horizontally from clouds is:

   • A.500 ft
   • B.1,000 ft
   • C.2,000 ft
   • D.1 statute mile
   Show answer & explanation

   Answer: C. 2,000 ft

   §107.51(d) — 2,000 ft horizontal and 500 ft below clouds.

5. Question 5

   What is the primary concern with a fast-moving cold front for UAS operations?

   • A.Prolonged IFR conditions
   • B.Rapid weather changes — gusty winds, towering cumulus, thunderstorms
   • C.Increased visibility
   • D.Warmer temperatures aloft
   Show answer & explanation

   Answer: B. Rapid weather changes — gusty winds, towering cumulus, thunderstorms

   Fast cold fronts force warm air aloft rapidly, often producing squall lines, thunderstorms, and wind shifts.

54 more Weather questions are in the app, along with explanations and flashcards for every one.

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