China Civil UAV Theory Questions — Questions 601–610

Using the formula ft = m × 3.28084: 100 m × 3.28084 ≈ 328.08 feet, closest to 328 feet.

Using the formula ft = m × 3.28084: 60 m × 3.28084 ≈ 196.85 feet, closest to 200 feet.

The atmosphere contains clouds, rain, and dust: it is a mixture of air, water vapor, and liquid or solid impurities.

The higher the surface temperature, the stronger the convection and the higher the tropopause. Therefore it is higher in summer than in winter, and higher at the equator than at the poles.

Cumulonimbus cloud towers rise high, with tops blown by strong upper winds into a mane-like shape, matching the description; altocumulus and false cirrus lack this feature.

An inversion layer is a stable air layer that suppresses air convection, so pollutants do not disperse easily and visibility below it is poor. Option A is wrong (density changes have little flight effect); option C is wrong (in an inversion layer, temperature rises with height).

In an inversion layer, air is cold below and warm above, in a stable state, so it is a stable air layer.

According to regulations, when circumnavigating thunderstorms outside clouds at night, distance from cumulonimbus and towering cumulus must be no less than 10 km.

Tropospheric air heat comes mainly from ground radiation; the farther from the ground, the less heating, so temperature decreases with increasing height.

The higher the pressure, the lower the density. Simple memory: under gravity, plateau air is thin and low-density, with lower pressure than plains.