DGCA Meteorology: The Atmosphere Questions

Correct answer: B. Latitude only

Tropopause is higher near the equator and lower at the poles because of temperature. Longitude doesn’t change it much.

Correct answer: B. Layer separating troposphere from stratosphere

The tropopause splits the weather-filled troposphere from the stable stratosphere.

Correct answer: B. Separates the troposphere from the stratosphere

The tropopause marks where the troposphere’s weather ends and the stratosphere begins.

Correct answer: B. Decrease in latitude

The troposphere is thicker at the equator due to warmer, rising air.

Correct answer: C. Stratosphere

The stratosphere is the layer above the tropopause where temperature is steady or increases with height due to ozone absorption of ultraviolet radiation, making it a stable, inversion-like layer with little vertical motion.

Correct answer: A. is almost constant

In the lower stratosphere the temperature is almost constant with height (roughly isothermal near -56.5 degrees C in ISA); the increase with altitude occurs higher up, in the upper stratosphere due to ozone heating.

Correct answer: C. 10-12 km

At about 50 degrees N the tropopause averages roughly 10 to 12 km, lower than the 16 to 18 km of equatorial latitudes and higher than the 8 km or so found over the poles.

Correct answer: B. Mesosphere

Noctilucent clouds are extremely high, tenuous ice-crystal clouds that form near the mesopause at around 75–85 km altitude, placing them in the mesosphere. They are far above the stratosphere and are seen shining at night when the sun, below the observer's horizon, still illuminates them.

Correct answer: D. Decreases

In the ICAO standard atmosphere temperature decreases steadily with altitude at 6.5°C per kilometre (about 2°C per 1000 ft), from +15°C at sea level to -56.5°C at the tropopause.

Correct answer: A. It is higher in polar regions than in equatorial regions

The polar tropopause lies at only about 8 km, so the temperature fall with height stops much sooner, leaving it near -45 to -50°C. Over the equator the tropopause is near 16 km and cooling continues to about -75 to -80°C, so the polar tropopause is the warmer one.

Correct answer: A. Tropopause

The tropopause is the boundary separating the troposphere from the stratosphere, defined as the level where temperature effectively ceases to decrease with height.

Correct answer: A. Low

The 700 hPa surface lies near 10,000 ft, where the ISA temperature is about -5°C. A reading of -15°C is roughly 10°C colder than standard, which is characterised as low.