quiz 1

Question 1

Composition of the earths dry atmosphere is about

Answer 1

21% oxygen,78% nitrogen and 1% other gases

Question 2

Air is never completely dry,it contains near 0 to what % of water vapor

Answer 2

5%

Question 3

The transition zone between the lowest layer of the atmosphere and the layer above it is
called the _______________________________. This transition zone acts to trap most
of the water vapor in the _______________________________.

Answer 3

Tropoause

Troposphere

Question 4

ISA stands for

Answer 4

International standard atmosphere

Question 5

. In the ISA, the sea-level temperature and pressure is _______oC, ______oF and
___________”Hg, ___________ mb(hPa).

Answer 5

15
59
29.92
1013.2

Question 6

At the lower levels of the ISA, the temperature decreases at ______oC per 1,000’ of
altitude increase, and the pressure drops ______”Hg per 1,000’ of altitude increase

Answer 6

2

1

Question 7

The standard temperature at 10,500 MSL is _______oC

Answer 7

-6

Question 8

The standard temperature at 25,000 MSL is _______oC

Answer 8

-35

Question 9

_________________ ___________________ is the cause of most weather
phenomena

Answer 9

Temp variation

Question 10

T/F Temperature is a major factor in determining aircraft performance

Answer 10

T

Question 11

The Earth receives energy from the sun in the form of solar radiation. In turn, the Earth
radiates energy back out into space thru ____________________
_____________________.

Answer 11

Terrestrial radiation

Question 12

Two commonly used temperature scales are __________________ and
_____________________.

Answer 12

Celsius and Fahrenheit

Question 13

What are the conversion formulas for Celsius and Fahrenheit?
oC =
oF =

Answer 13

5/9(F-32)

9/5C+32

Question 14

Convert 25 degrees F to C

Answer 14

-3.5

Question 15

Which scale is always used to report temperatures aloft and on the ground in aviation
weather reports and forecast?

Answer 15

Celsius

Question 16

When heated, air Expands / Contracts. When cooled, air Expands / Contracts

Answer 16

Expands

Contracts

Question 17

Explain why you would see higher temperature variations in dry arid inland environments
as compared to coastal environments.

Answer 17

Water is much more resistant to temp change and warms up or cools down areas around it faster or slower

Question 18

Why does the amount of solar radiation received vary by region?

Answer 18

seasons,latitude,topography and altitude

Question 19

. An ________________________ often develops near the ground on clear, cool nights
when wind is light which causes the temperature to increase with height.

Answer 19

inversion

Question 20

_____________ absorbs and radiates heat much faster than ___________________.

Answer 20

Land

Water

Question 21

The instrument designed for measuring atmospheric pressure is the _______________________

Answer 21

Barometer

Question 22

Two commonly used pressure units are _____________________ and ____________________

Answer 22

inches of mercury hg

hectopascal hPa

Question 23

The standard pressure at mean sea level is ____________ or _____________________.

Answer 23

29. 29 in

1013. 25 md

Question 24

Pressure varies primarily with ___________________ and ________________________

Answer 24

Altitude

temperature

Question 25

Station Press” is the pressure measured at ___________________________________________

Answer 25

field elevation

Question 26

Within the lower few thousand feet of the troposphere, the pressure decreases roughly _____ per ______-foot increase in altitude; therefore the ISA pressure at 7,500’ MSL is _______.

Answer 26

1in 1000 22.42

Question 27

The rate of decrease of pressure with height in warm air is ______________than standard, and the rate of decrease of pressure with height in cold air is _________________than standard

Answer 27

less | greater

Question 28

The higher we go, the slower / faster is the rate of decrease with height.

Answer 28

slower

Question 29

What are isobars?

Answer 29

lines that plot sea level pressure on a map

Question 30

A LOW is

Answer 30

area of pressure surrounded on all sides by high pressure

Question 31

A HIGH is

Answer 31

surrounded on all sides by low pressure

Question 32

A TROUGH

Answer 32

enlongated area of low pressure

Question 33

Low-pressure systems are often are regions of______________ flying weather, while high-pressure systems are often regions of _____________ flying weather.

Answer 33

poor | favorible

Question 34

True altitude is the distance above ______________ _______________ ___________

Answer 34

MSL

Question 35

Indicated Altitude is ______________________________________________

Answer 35

altitude above mean sea level when set to local

Question 36

While flying, barometric pressure drops .75”Hg. You fail to adjust your altimeter setting. Once you arrive to your destination you would be _______feet higher / lower than your intended altitude.

Answer 36

750 lower

Question 37

Pressure Altitude is __________________________

Answer 37

Pressure altitude is the height above a standard datum plane (SDP), which is a theoretical level where the weight of the atmosphere is 29.92 "Hg (1,013.2 mb) as measured by a barometer.

Question 38

You can determine pressure altitude by setting your altimeter to the standard altimeter setting of _______ in the window.

Answer 38

29.92

Question 39

When descending through 18,000 feet MSL you must _________

Answer 39

set altimeter

Question 40

Pressure altitude is 8000 feet. Temperature is 76F. What is the density altitude?___________

Answer 40

11,000

Question 41

Describe how high density altitude affects aircraft performance

Answer 41

reduces power because there is less air and less propeller grip,less thrust and lift

Question 42

Hypoxia may affect night vision at altitudes as low as ______

Answer 42

5000

Question 43

Differences in atmospheric pressure are caused by differences in _____

Answer 43

Temp

Question 44

The horizontal air flow in a convective current is called ________

Answer 44

wind

Question 45

Closely spaced isobars mean ___________________________ whereas widely spaced isobars mean _________________________.

Answer 45

strong winds | light winds

Question 46

Explain Coriolis Effect. _______

Answer 46

air moving across the surface of the earth seems to be deflected by rotational forces

Question 47

Because of the Coriolis effect, in the northern hemisphere the wind around a High moves Clockwise / Counterclockwise, and the wind around a Low moves Clockwise / Counterclockwise

Answer 47

clockwise | counterclockwise

Question 48

Generally, as a rule of thumb, if you are flying on a cross country flight in a left crosswind, you are flying toward an area of ___________________ weather.

Answer 48

Bad

Question 49

Why are the winds in a hurricane so strong? _____

Answer 49

very low pressure

Question 50

At the surface, ____________________ causes the wind to flow at an approximate 30o angle to isobars

Answer 50

friction

Question 51

A Jet Stream is a band of winds meandering through the atmosphere at a level near the

Answer 51

tropopause

Question 52

Where is wind shear normally found?

Answer 52

two different wind masses moving at different speeds

Question 53

What is the primary danger of wind shear?

Answer 53

turbulance