Atmosphere of Earth

Which statement best describes what ISA provides?

• A set of random weather forecasts for each day of the year.

• Standard values of pressure, temperature, and other properties of air in different layers of the atmosphere.

• A list of cloud names that appear over the oceans.

• Rules for building airplanes.

What is the air pressure at sea level according to ISA?

• 1013.25 hPa

• 226.32 hPa

• 5474.9 hPa

• 66.939 hPa

Which type of cloud is typical for thunderstorms and is abbreviated as Cb?

• Altostratus

• Cumulonimbus

• Cirrus

• Stratus

Which type of cloud in the diagram extends from low level to high level and is associated with heavy precipitation?

• Cirrus (Ci)

• Cumulonimbus (Cb)

• Stratus (St)

• Altocumulus (Ac)

What do "thermals" (updrafts) cause according to the text?

• Warm air descends and cold air rises

• Heat from the sun lifts warm air masses and cold ones descend

• The wind completely stops

• They only occur at sea

What can be the maximum speed of a jet stream according to the material?

• 20 m/s (72 km/h)

• 200 m/s (700 km/h)

• 500 m/s (1800 km/h)

• 2 m/s (7 km/h)

Which statement about CAT is true according to the text?

• It is easily visible to the naked eye

• It is clearly visible on radar

• It is invisible to the human eye and difficult to detect on radar

• It only occurs during thunderstorms with rain

Which of the following numbers best corresponds to a speed of 200 m/s converted in the text?

• 70 km/h

• 200 km/h

• 700 km/h

• 1200 km/h

How would you simply explain to a classmate what "varying wind speeds" means in the definition of wind shear?

• Different wind speeds in individual layers

• The same wind speed everywhere

• No wind

• Wind that always blows to the west