WEATHER QUIZ 2

Question 1

Name the 5 temperature variations which create forces that drive the atmosphere’s endless motions…
Jet streams, pressure changes, temperature zones, lunar radiation
Ocean currents, Seasonal, Topography, and Altitude
Diurnal, Seasonal, Latitude, Topography, and Altitude.

Answer 1

Diurnal, Seasonal, Latitude, Topography, and Altitude.

Question 2

The troposphere is the layer that goes from the surface to approximately what average altitude?
45000 feet over the poles to 65,000 feet over the equator and is higher in summer than winter.
5,000 feet over the poles to 15,000 feet over the equator and is higher in summer than winter.
2000 feet over the poles to 5,000 feet over the equator and is higher in summer than winter.
7 miles, it slopes from 20,000 feet over the poles to 65,000 feet over the equator and is higher in summer than winter.

Answer 2

7 miles, it slopes from 20,000 feet over the poles to 65,000 feet over the equator and is higher in summer than winter.

Question 3

The troposphere is the layer that goes from the surface to approximately what average altitude?
45000 feet over the poles to 65,000 feet over the equator and is higher in summer than winter.
5,000 feet over the poles to 15,000 feet over the equator and is higher in summer than winter.
2000 feet over the poles to 5,000 feet over the equator and is higher in summer than winter.
7 miles, it slopes from 20,000 feet over the poles to 65,000 feet over the equator and is higher in summer than winter.

Answer 3

7 miles, it slopes from 20,000 feet over the poles to 65,000 feet over the equator and is higher in summer than winter.

Question 4

Everything else being equal, why does wind blowing across isobars become slower at the surface than aloft?
Friction between the Jet streams and the terrain surface slows the wind.
Friction between the wind and the terrain surface slows the wind.
Friction between the wind and the terrain surface speeds up the wind.

Answer 4

Friction between the wind and the terrain surface slows the wind.

Question 5

About what percentage of the atmosphere is oxygen?
  24%.
  21%.
  30%.
  80%.

Answer 5

21%.

Question 6

Is cooler air more or less dense than warmer air?
Cooler air is lighter and rises becoming more dense than warmer air.
Cooler air is heavier and sinks becoming more dense than warmer air.
Cooler air is lighter and sinks becoming more dense than warmer air.
Cooler air is heavier and sinks becoming less dense than warmer air.

Answer 6

Cooler air is heavier and sinks becoming more dense than warmer air.

Question 7

What is terrestrial radiation?
The Earth radiates energy, this incoming energy is terrestrial radiation.
The Earth radiates energy, this outgoing energy is terrestrial radiation.
It’s the energy exerted by the sun.
The Earth radiates pressure, this outgoing energy is terrestrial radiation.

Answer 7

The Earth radiates energy, this outgoing energy is terrestrial radiation.

Question 8

Standard atmosphere at sea level is 15 degrees Celsius and 29.92” Hg, by definition however, how would you describe what standard atmosphere is?
The result is specified sea- d pressure level temperature and specific rates of change of temperature and pressure with altitude.
Based on temperature alone.
Based on pressure alone.

Answer 8

The result is specified sea- d pressure level temperature and specific rates of change of temperature and pressure with altitude.

Question 9

How is the standard atmosphere determined?
Based on engine performance calculations and rations.
Above average conditions throughout the atmosphere.
Average conditions throughout the atmosphere for all latitudes, seasons and altitudes.

Answer 9

Average conditions throughout the atmosphere for all latitudes, seasons and altitudes.

Question 10

In the northern hemisphere, high pressure air circulates:
Outward, downward, and counterclockwise.
Inward, downward, and clockwise.
Outward, downward, and clockwise.

Answer 10

Outward, downward, and clockwise.

Question 11

What is a jet stream and where is it found?
The jet stream is a narrow band of strong wind (by arbitrary definition, it has wind speeds of 50knts or greater) meandering through the atmosphere at a level near the tropopause. The jet stream is always found at a vertical break in the tropopause where the tropical and polar tropopauses meet.
The jet stream is a narrow band of strong wind (by arbitrary definition, it has wind speeds of 50knts or greater) meandering through the atmosphere at a level near the tropopause. The jet stream is always found at a horizontal break in the tropopause where the tropical and polar tropopauses meet.
The jet stream is a narrow band of strong wind (by arbitrary definition, it has wind speeds of 100knts or greater) meandering through the atmosphere at a level near the tropopause. The jet stream is always found at a vertical break in the tropopause where the tropical and polar tropopauses meet.

Answer 11

The jet stream is a narrow band of strong wind (by arbitrary definition, it has wind speeds of 50knts or greater) meandering through the atmosphere at a level near the tropopause. The jet stream is always found at a vertical break in the tropopause where the tropical and polar tropopauses meet.

Question 12

What percentage of the sun” energy is absorbed by Earth?
About 15%.
About 45%, the other 55% is reflected by the Earth and its atmosphere.
About 80%.
About 20%.

Answer 12

About 45%, the other 55% is reflected by the Earth and its atmosphere.

Question 13

What is a thermal Low?
A dry, sunny region that becomes cold from intense surface cooling, thus generating a surface low.
A moist, sunny region that becomes warm from intense surface heating, thus generating a surface low.
A dry, sunny region that becomes warm from intense surface heating, thus generating a surface low.
A wet, sunny region that becomes warm from intense surface heating, thus generating a surface low.

Answer 13

A dry, sunny region that becomes warm from intense surface heating, thus generating a surface low.

Question 14

What affect does surface friction have on wind?
The rougher the terrain, the greater the fictional force. Friction is an effective force and always acts to oppose wind direction.
The rougher the terrain, the less the fictional force. Friction is an effective force and always acts to energize wind direction.
Very little affect.

Answer 14

The rougher the terrain, the greater the fictional force. Friction is an effective force and always acts to oppose wind direction.

Question 15

What are the 3 belts of prevailing winds in the northern hemisphere?
  Polar easterlies (north of 60 latitude), prevailing westerlies (between 30 and 60 latitude) and Jet winds (between the equator and 30 latitude).
  Jet Streams (north of 60 latitude), prevailing westerlies (between 30 and 60 latitude) and trade winds (between the equator and 30 latitude).
  Polar easterlies (south of 60 latitude), prevailing westerlies (between 30 and 60 latitude) and trade winds (between the equator and 30 latitude).
  Polar easterlies (north of 60 latitude), prevailing westerlies (between 30 and 60 latitude) and trade winds (between the equator and 30 latitude).

Answer 15

Polar easterlies (north of 60 latitude), prevailing westerlies (between 30 and 60 latitude) and trade winds (between the equator and 30 latitude).

Question 16

The tropopause is of great interest to pilots of jet aircraft two reasons, they are…
There is an no change in temperature lapse rate which affects the performance of a jet engine and maximum winds (i.e. jet stream) and narrow zones of wind shear are found at the tropopause.
There is an abrupt change in temperature lapse rate which affects the performance of a jet engine and maximum winds (i.e. jet stream) and narrow zones of wind shear are found at the tropopause.
There is an abrupt change in temperature lapse rate which affects the performance of a jet engine and maximum winds (i.e. jet stream) and wide zones of wind shear are found at the tropopause.
There is an abrupt change in temperature lapse rate which does not affect the performance of a jet engine and maximum winds (i.e. jet stream) and narrow zones of wind shear are found at the tropopause.

Answer 16

There is an abrupt change in temperature lapse rate which affects the performance of a jet engine and maximum winds (i.e. jet stream) and narrow zones of wind shear are found at the tropopause.

Question 17

What is the difference between pressure altitude and density altitude?
Pressure altitude is the height above the standard datum pressure (29.92” Hg, sea level under ISA). Density altitude is pressure altitude corrected for nonstandard temperatures. Density altitude is used for determining aerodynamic performance in the nonstandard atmosphere.
Pressure altitude is the height above the standard datum pressure (29.92” Hg, sea level under ISA). Density altitude is pressure altitude corrected for nonstandard pressure. Density altitude is used for determining aerodynamic performance in the standard atmosphere.
Pressure altitude is the height above the standard datum pressure (29.92” Hg, sea level under ISA). Density altitude is pressure altitude corrected for nonstandard temperatures. Density altitude is used for determining aerodynamic performance in the standard atmosphere.

Answer 17

Pressure altitude is the height above the standard datum pressure (29.92” Hg, sea level under ISA). Density altitude is pressure altitude corrected for nonstandard temperatures. Density altitude is used for determining aerodynamic performance in the nonstandard atmosphere.

Question 18

What is Atmospheric Pressure?
It’s the weight of the air moisture calculated at the surface level.
It is the force per unit area exerted by the weight of the atmosphere.
It’s the force per unit of area exerted by the temperature lapse rate.
It’s the pressure exerted when air temperature is increased.

Answer 18

It is the force per unit area exerted by the weight of the atmosphere.

Question 19

What is diurnal variation?
It is the change in temperature from day to night brought about by rotation of the moon.
It is the change in temperature from day to night brought about by rotation of the Earth.
It is the change in pressure from day to night brought about by rotation of the Earth.

Answer 19

It is the change in temperature from day to night brought about by rotation of the Earth.

Question 20

Do closely spaced isobars indicate stronger or lighter winds?
The stronger the pressure gradient force, the stronger the wind. Closely spaced isobars mean light winds.
The weaker the pressure gradient force, the stronger the wind. Closely spaced isobars mean strong winds.
The stronger the pressure gradient force, the stronger the wind. Closely spaced isobars mean strong winds.

Answer 20

The stronger the pressure gradient force, the stronger the wind. Closely spaced isobars mean strong winds.

Question 21

Describe how the general circulation of air in the northern hemisphere from the equator to the poles is formed.
Warm air forced aloft at the equator moves south toward the poles and turns to the right (coriolis effect), becoming a westerly wind at about 30 lat. Cool polar air descends and makes its way towards the equator, it too shifts to the right and by the 60 lat forms the polar easterlies. Air piles up at the 30 and 60 lat in both hemispheres. This creates a high press belt that ids the basis for mid-lat band of storms and weather.
Warm air forced aloft at the equator moves east toward the poles and turns to the right (coriolis effect), becoming a westerly wind at about 30 lat. Cool polar air descends and makes its way towards the equator, it too shifts to the right and by the 60 lat forms the polar easterlies. Air piles up at the 30 and 60 lat in both hemispheres. This creates a low press belt that ids the basis for mid-lat band of storms and weather.
Warm air forced aloft at the equator moves north toward the poles and turns to the right (coriolis effect), becoming a westerly wind at about 30 lat. Cool polar air descends and makes its way towards the equator, it too shifts to the right and by the 60 lat forms the polar easterlies. Air piles up at the 30 and 60 lat in both hemispheres. This creates a high press belt that ids the basis for mid-lat band of storms and weather.

Answer 21

Warm air forced aloft at the equator moves north toward the poles and turns to the right (coriolis effect), becoming a westerly wind at about 30 lat. Cool polar air descends and makes its way towards the equator, it too shifts to the right and by the 60 lat forms the polar easterlies. Air piles up at the 30 and 60 lat in both hemispheres. This creates a high press belt that ids the basis for mid-lat band of storms and weather.

Question 22

What is a pressure gradient force?
Pressure differences must create a force in order to drive the wind. The force is from higher pressure to lower pressure and is perpendicular to isobars or contours. This force is the pressure gradient force.
Pressure differences must create a force in order to drive pressure changes. The force is from low pressure to higher pressure and is perpendicular to isobars or contours. This force is the pressure gradient force.
Pressure differences must create a force in order to drive the wind. The force is from higher pressure to lower pressure and is parallel to isobars or contours. This force is the pressure gradient force.

Answer 22

Pressure differences must create a force in order to drive the wind. The force is from higher pressure to lower pressure and is perpendicular to isobars or contours. This force is the pressure gradient force.

Question 23

When flying into colder than standard temperatures are you at a higher or lower true altitude than what your altimeter indicates?
You are at a higher true altitude.
Your altitude remains the same.
You are at lower true altitude.

Answer 23

You are at lower true altitude.

Question 24

When flying from high pressure to low pressure at a constant indicated altitude and without adjusting the altimeter, do you gain or lose true altitude?
Gain altitude.
You lose true altitude.
It remains the same.

Answer 24

You lose true altitude.

Question 25

What does 1013.2 mb equate to in inches of mercury?
Standard atmospheric pressure at sea level is 1013.9 millibars, which is the equivalent of 29.85 inches of mercury.
Standard atmospheric pressure at sea level is 1013.2 millibars, which is the equivalent of 28.92 inches of mercury.
Standard atmospheric pressure at sea level is 1013.2 millibars, which is the equivalent of 29.92 inches of mercury.

Answer 25

Standard atmospheric pressure at sea level is 1013.2 millibars, which is the equivalent of 29.92 inches of mercury.

Question 26

Does warmer air expand or contract?
It contracts because of temperature change.
It remains constant. Only pressure creates expansion.
Warmer air expands and become lighter and less dense than colder air.
Correct

Answer 26

Warmer air expands and become lighter and less dense than colder air.