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TIẾNG ANH (TRẮC NGHIỆM)
Multiple Choice Exam Questions
Chapter 1
1. The primary source of energy for the earth's atmosphere is:
b. the sun
2. The most abundant gases in the earth's atmosphere by volume are:
c. nitrogen and oxygen
4. Water vapor is:
a. a gas
7. Which of the following is considered a variable gas in the earth's
atmosphere?
a. water vapor
8. The gas that shows the most variation from place to place and
from time to time in the lower
atmosphere:
c. water vapor (H2O)
12. In the atmosphere, tiny solid or liquid suspended particles of
various composition are called:
a. aerosols
13. The most abundant greenhouse gas in the earth's atmosphere:
c. water vapor (H2O)
17. Which of the following processes acts to remove carbon dioxide
from the atmosphere?
c. photosynthesis
19. The earth's first atmosphere was composed primarily of:
b. hydrogen and helium
21. The most abundant gas emitted from volcanoes is:
e. water vapor
23. This holds a planet's atmosphere close to its surface:
b. gravity
24. The amount of force exerted over an area of surface is called:

d. pressure
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25. Much of Tibet lies at altitudes over 18,000 feet where the
pressure is about 500 mb. At such
altitudes, the Tibetans are above roughly:
c. 50% of the air molecules in the atmosphere
28. Which of the following weather elements always decreases as we
climb upward in the
atmosphere?
c. pressure
32. The gas responsible for the greenhouse effect on Venus:
a. carbon dioxide (CO2)
33. The planet with a strong greenhouse effect, whose surface
temperature averages 480 oC
(900 oF):
b. Venus
35. The earth's atmosphere is divided into layers based on the vertical
profile of:
b. air temperature
37. Almost all of the earth's weather occurs in the:
e. troposphere
39. The hottest atmospheric layer is the:
c. thermosphere
41. The atmospheric layer in which we live is called the:
a. troposphere
43. The instrument that measures temperature, pressure, and

humidity at various altitudes in
the atmosphere:
b. radiosonde
44. Warming in the stratosphere is mainly caused by:
a. absorption of ultraviolet radiation by ozone
45. In a temperature inversion:
a. air temperature increases with increasing height
46. The rate at which temperature decreases with increasing altitude
is known as the:
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b. lapse rate
49. The electrified region of the upper atmosphere is called the:
d. ionosphere
52. The gas that absorbs most of the harmful ultraviolet radiation in
the stratosphere:
d. ozone
55. Which latitude belt best describes the middle latitudes?
e. 30o to 50o
58. The wind direction is:
a. the direction from which the wind is blowing
77. In an average year, more people die from this than from any other
natural disaster.
d. flash floods and flooding
Chapter 2
1. Which of the following provides a measure of the average speed
of air molecules?

b. temperature
3. Which of the following is not considered a temperature scale?
c. Calorie
4. The temperature scale where 0o represents freezing and 100o
boiling:
b. Celsius
5. The temperature scale that sets freezing of pure water at 32o F:
b. Fahrenheit
9. Heat is energy in the process of being transferred from:
a. hot objects to cold objects
10. The heat energy released when water vapor changes to a liquid is
called:
d. latent heat of condensation
11. The change of state of ice into water vapor is known as:
b. sublimation
12. When water changes from a liquid to a vapor, we call this
process:
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e. evaporation
14. The cold feeling that you experience after leaving a swimming
pool on a hot, dry, summer
day represents heat transfer by:
d. latent heat
16. The processes of condensation and freezing:
a. both release sensible heat into the environment
17. The transfer of heat by molecule-to-molecule contact:

a. conduction
18. Which of the following is the poorest conductor of heat?
a. still air
19. The horizontal transport of any atmospheric property by the wind
is called:
a. advection
20. A heat transfer process in the atmosphere that depends upon the
movement of air is:
d. convection
23. Rising air cools by this process:
a. expansion
25. The proper order from shortest to longest wavelength is:
c. ultraviolet, visible, infrared
26. Sinking air warms by this process:
a. compression
27. Heat transferred outward from the surface of the moon can take
place by:
d. radiation
29. If the average temperature of the sun increased, the wavelength
of peak solar emission
would:
a. shift to a shorter wavelength
30. Solar radiation reaches the earth's surface as:
e. ultraviolet, visible, and infrared radiation
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31. Electromagnetic radiation with wavelengths between 0.4 and 0.7

micrometers is called:
b. visible light
33. The blueness of the sky is mainly due to:
a. the scattering of sunlight by air molecules
34. Which of the following determine the kind (wavelength) and
amount of radiation that an
object emits?
a. temperature
35. Often before sunrise on a clear, calm, cold morning, ice (frost)
can be seen on the tops of
parked cars, even when the air temperature is above freezing. This
condition happens because
the tops of the cars are cooling by:
d. radiation
37. Evaporation is a _________ process.
a. cooling
38. If you want to keep an object cool while exposed to direct
sunlight,
d. wrap it in aluminum foil with the shiny side facing
outward
39. Which of the following has a wavelength shorter than that of
violet light?
e. ultraviolet radiation
40. If the absolute temperature of an object doubles, the maximum
energy emitted goes up by a
factor of:
d. 16
42. How much radiant energy will an object emit if its temperature is
at absolute zero?
b. none

43. Most of the radiation emitted by a human body is in the form of:
c. infrared radiation and is invisible
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45. The sun emits its greatest intensity of radiation in:
a. the visible portion of the spectrum
47. The earth's radiation is often referred to as ________radiation,
while the sun's radiation is
often referred to as _________radiation.
c. longwave, shortwave
50. The earth emits radiation with greatest intensity at:
a. infrared wavelengths
51. "A good absorber of a given wavelength of radiation is also a
good emitter of that
wavelength." This is a statement of:
c. Kirchoff's Law
54. Without the atmospheric greenhouse effect, the average surface
temperature would be:
b. lower than at present
55. The earth's atmospheric window is in the:
c. infrared region
56. The atmospheric greenhouse effect is produced mainly by the:
c. absorption and re-emission of infrared radiation by the
atmosphere
57. Suppose last night was clear and calm. Tonight low clouds will
be present. From this you
would conclude that tonight's minimum temperature will be:

a. higher than last night's minimum temperature
59. Low clouds retard surface cooling at night better than clear skies
because:
a. the clouds absorb and radiate infrared energy back to
earth
60. At night, low clouds:
a. enhance the atmospheric greenhouse effect
61. Which of the following gases are mainly responsible for the
atmospheric greenhouse effect
in the earth's atmosphere?
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d. water vapor and carbon dioxide
63. The combined albedo of the earth and the atmosphere is
approximately:
c. 30%
64. According to the Stefan-Boltzmann law, the radiative energy
emitted by one square meter of
an object is equal to a constant multiplied by its temperature raised to
the _______ power.
c. fourth
67. The albedo of the earth's surface is only about 4%, yet the
combined albedo of the earth
and the atmosphere is about 30%. Which set of conditions below best
explains why this is so?
a. high albedo of clouds, low albedo of water
68. According to Wein’s displacement law, the wavelength at which

maximum radiation occurs
a. is inversely proportional to the temperature
71. On the average, about what percentage of the solar energy that
strikes the outer
atmosphere eventually reaches the earth's surface?
d. 50%
72. If the amount of energy lost by the earth to space each year were
not approximately equal to
that received:
a. the atmosphere's average temperature would change
73. If the sun suddenly began emitting more energy, the earth's
radiative equilibrium
temperature would:
a. increase
74. Sunlight that bounces off a surface is said to be ________ from
the surface.
d. reflected
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77. The atmosphere near the earth's surface is "heated from below."
Which of the following
does not significantly contribute to this heating?
d. heat energy from the earth's interior
78. The earth's radiative equilibrium temperature is:
a. the temperature at which the earth is absorbing solar
radiation and emitting
infrared radiation at equal rates

93. Sunlight passes through a thicker portion of the atmosphere at
e. both a and c
95. A red shirt
b. selectively scatters red wavelenghts of visible light and
absorbs the rest
96. Perspiration cools the body by
d. latent heat transfer
Chapter 3
1. During the winter in the Northern Hemisphere, the "land of the
midnight sun" would be found:
a. at high latitudes
3. In the Northern Hemisphere, this day has the fewest hours of
daylight:
b. winter solstice
4. During an equinox:
d. all of the above
7. During the winter solstice in the Northern Hemisphere:
d. all of the above
10. Where are the days and nights of equal length all year long?
d. at the Equator
12. Which of the following helps to explain why even though
northern latitudes experience 24
hours of sunlight on June 22, they are not warmer than latitudes
further south?
e. all of the above
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15. The north-facing side of a hill in a mountainous region in the US
tends to:
e. all of the above
17. The maximum in daytime surface temperature typically occurs
_______ the earth receives
its most intense solar radiation.
b. after
19. The strongest radiation inversions occur when
c. skies are clear
20. When it is January and winter in the Northern Hemisphere, it is
______and ________in the
SouthernHemisphere.
a. January and summer
21. The most important reason why summers in the Southern
Hemisphere are not warmer than
summers in the Northern Hemisphere is that:
c. over 80% of the Southern Hemisphere is covered with
water
23. Thermal belts are usually found
b. on hillsides
25. During a radiation inversion, wind machines
d. all of the above
26. The main reason(s) for warm summers in northern middle
latitudes is that:
e. only (b) and (c) are correct
27. Our seasons are caused by:
e. only (b) and (c) are correct
31. The earth is tilted at an angle of 23.5o with respect to the plane of
its orbit around the sun. If
the amount of tilt were increased to 40o, we would expect in middle

latitudes:
a. hotter summers and colder winters than at present
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33. Although the polar regions radiate away more heat energy than
they receive by insolation in
the course of a year, they are prevented from becoming progressively
colder each year by the:
c. circulation of heat by the atmosphere and oceans
37. In meteorology, the word insolation refers to:
c. incoming solar radiation
38. During the afternoon the greatest temperature difference between
the surface air and the air
several meters above occurs on a:
a. clear, calm afternoon
39. The greatest variation in daily temperature usually occurs:
a. at the ground
40. In most areas the warmest time of the day about 5 feet above the
ground occurs:
b. in the afternoon between 2 and 5 pm
42. The lowest temperature is usually observed:
d. around sunrise
44. Suppose yesterday morning you noticed ice crystals (frost) on the
grass, yet the minimum
temperature reported in the newspaper was only 35o F. The most
likely reason for this apparent
discrepancy is that:

a. temperature readings are taken in instrument shelters
more than 5 feet above
the ground
46. At what time during a 24-hour day would a radiation temperature
inversion best be
developed?
b. near sunrise
47. The lag in daily temperature refers to the time lag between the:
a. time of maximum solar radiation and the time of
maximum temperature
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48. Ideal conditions for a strong radiation inversion:
a. clear, calm, dry, winter night
49. Thermal belts are:
c. warmer hillsides that are less likely to experience freezing
conditions
50. The primary cause of a radiation inversion is:
a. infrared radiation emitted by the earth's surface
51. The deepest radiation inversion would be observed:
b. in polar regions in winter
53. On a clear, calm, night, the ground and air above cool mainly by
this process:
e. radiation
54. Which of the following can be used as a method of protecting an
orchard from damaging low
temperatures during a radiation inversion?

d. all of the above
57. Lines connecting points of equal temperature are called:
b. isotherms
58. In summer, humid regions typically have ________daily
temperature ranges and
_______maximum temperatures than drier regions.
a. smaller, lower
62. An important reason for the large daily temperature range over
deserts is:
a. there is little water vapor in the air to absorb and reradiate infrared radiation
64. Two objects A and B have the same mass but the specific heat of
A is larger than B. If both
objects absorb equal amounts of energy:
b. B will become warmer than A
65. The largest annual ranges of temperatures are found:
a. at polar latitudes over land
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67. This is used as a guide to planting and for determining the
approximate date for harvesting
crops:
a. growing degree-days
68. This is used as an index for fuel consumption:
c. heating degree-days
69. Which of the following is not a reason why water warms and
cools much more slowly than
land?

e. it takes more heat to raise the temperature of a given
amount of soil 1o C than
it does to raise the temperature of water 1o C.
74. In calm air the air temperature is -10o C, if the wind speed
should increase to 30 knots (with
no change in air temperature) the thermometer would indicate:
c. a temperature of -10o C
75. The air temperature is 45o F, the wind is blowing at 30 MPH, and
the wind chill temperature
is 15o F. These conditions would be equivalent to:
a. a 15o F air temperature and 0 MPH winds
76. Hypothermia is most common in:
b. cold, wet weather
78. The wind-chill factor:
a. relates body heat loss with wind to an equivalent
temperature with no wind
95. In the northern hemisphere, the number of hours of daylight
begin to shorten after the
b. summer solstice
96. At any given time, ______ of the earth is illuminated by the sun.
c. one-half
103. Water heats up ______ and cools off _____ than land.
d. more slowly, more slowly
Chapter 4
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1. If a glass of water were surrounded by saturated air:

c. the level of the water in the glass would not change
3. As the air temperature increases, the air's capacity for water vapor:
a. increases
4. If all the water vapor in the atmosphere were to condense and fall
to the ground, the globe
would be covered with about of water.
b. 1 inch
5. The total mass of water vapor stored in the atmosphere at any
moment is about ________of
the world's supply of precipitation.
b. 1 week
7. The density of water vapor in a given parcel of air is expressed by
the:
a. absolute humidity
8. Which of the following will increase in a rising parcel of air?
b. relative humidity
9. Which of the following will decrease in a rising parcel of air?
b. absolute humidity
10. The ratio of the mass of water vapor in a given volume (parcel)
of air to the mass of the
remaining dry air describes the:
b. mixing ratio
11. When the air temperature increases, the saturation vapor pressure
will:
a. increase
12. The maximum pressure that water vapor molecules would exert
if the air were saturated is
called the:
d. none of the above
13. If water vapor comprises 3.5% of an air parcel whose total

pressure is 1000 mb, the water
vapor pressure would be:
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b. 35 mb
15. If the air temperature increased, with no addition or removal of
water vapor, the actual vapor
pressure would:
c. stay the same
16. When the air temperature is below freezing, the saturation vapor
pressure over water is .
c. greater than the saturation vapor pressure over ice
19. The Gulf Coast states are more humid in summer than the coastal
areas of Southern
California mainly because of the:
c. higher water temperature in the Gulf of Mexico
20. If very cold air is brought indoors and warmed with no change in
its moisture content, the
saturation vapor pressure of this air will______ and the relative
humidity of this air will_____ .
c. increase, decrease
27. The main reason why vegetables take longer to cook in boiling
water at high altitudes is
because:
b. the temperature of the boiling water decreases with
increasing altitude
28. The temperature at which water boils depends mainly on:

c. air pressure
29. The percentage of water vapor present in the air compared to that
required for saturation is
the:
d. relative humidity
31. At what time of day is the relative humidity normally at a
minimum?
a. when the air temperature is highest
32. The time of day when the relative humidity reaches a maximum
value is usually:
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c. at the time when the air temperature is lowest
33. The dew point temperature is a measure of the total amount of
water vapor in the air.
a. true
34. As the air temperature increases, with no addition of water vapor
to the air, the relative
humidity will:
c. decrease
40. Suppose saturated polar air has an air temperature and dew point
of -10o C, and
unsaturated desert air has an air temperature of 35o C and a dew
point of 10o C. The desert air
contains ______water vapor and has a ________relative humidity
than the polar air.
a. more, lower

42. As the difference between the air temperature and the dew point
increases, the relative
humidity:
b. decreases
43. The temperature to which air must be cooled in order to become
saturated is the:
b. dew point temperature
44. As the air temperature increases, with no addition of water vapor
to the air, the dew point
will:
a. remain the same
52. Nighttime temperatures rarely drop below the dew point
temperature because
c. at saturation, latent heat of condensation is released into
the air

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