Name____________________
QUIZ
Relative Humidity, Dew Point,
Station Models and Air Masses
1. Which weather change is most likely indicated by
rapidly falling air pressure?
A)
B)
C)
D)
____/24x 100 =
6. A weather instrument is shown below.
Humidity is decreasing.
Temperature is decreasing.
Skies are clearing.
A storm is approaching.
2. The chart below shows the air temperature and the
dewpoint temperature near the ground at a given
location for four consecutive days. All temperatures
were recorded at noon.
Which statement is best supported by the data?
A) Relative humidity was highest on day 1.
B) The greatest amount of water vapor was in the
atmosphere on day 2.
C) The base level for cloud formation was highest
on day 3.
D) The chance of precipitation was greatest on day
4.
3. Weather-station measurements indicate that the
dewpoint temperature and air temperature are getting
farther apart and that air pressure is rising. Which
type of weather is most likely arriving at the station?
A)
B)
C)
D)
cool, dry air
maritime tropical air
4. An air mass entering Alaska from the northern Pacific
Ocean would most likely be labeled on a weather map
as
B) cT
C) mP
D) mT
5. Which type of air mass is associated with warm, dry
atmospheric conditions?
A) cP
B) cT
A) wind speed
C) cloud cover
B) precipitation
D) air pressure
7. Compared to a maritime tropical air mass, a maritime
polar air mass has a
A)
B)
C)
D)
higher temperature and more water vapor
higher temperature and less water vapor
lower temperature and more water vapor
lower temperature and less water vapor
8. The properties of an air mass are mostly determined
by the
a snowstorm
a warm front
A) cP
Which weather variable is measured by this
instrument?
C) mP
D) mT
A)
B)
C)
D)
rate of Earth’s rotation
direction of Earth’s surface winds
source region where the air mass formed
path the air mass follows along a land surface
9. What is the approximate dewpoint temperature if the
dry-bulb temperature is 13ºC and the wet-bulb
temperature is 10ºC?
A) 7ºC
C) 3ºC
B) 10ºC
D) -25ºC
Relative Humidity, Dew Point,
10.Which map shows the two correctly labeled air masses that frequently converge in the central plains to
cause tornadoes?
A)
B)
C)
D)
11. Which station model represents a location that has
the greatest chance of precipitation?
A)
B)
C)
D)
12. Which station model shows a wind direction from
the southeast?
A)
B)
C)
D)
13. What are the dewpoint and wind direction shown on
the station model below?
A)
B)
C)
D)
72°F and wind from the northeast
72°F and wind from the southeast
74°F and wind from the northwest
74°F and wind from the southwest
14. What is the dewpoint temperature when the dry-bulb
temperature is 14°C and the wet-bulb temperature is
10°C?
A) -17°C
C) 3°C
B) 6°C
D) 4°C
Relative Humidity, Dew Point,
15. Which set of instruments is correctly paired with the weather variables that they measure?
A)
B)
C)
D)
Base your answers to questions 16 and 17 on the weather map below. The map shows isobars and
seven weather station models. Four of the weather stations are identified by letters A, B, C, and D.
16. What was the probable air pressure, in millibars, at station D?
A) 1015.0 mb
B) 1017.0 mb
C) 102l.0 mb
D) 1036.0 mb
17. Which weather station had the highest relative humidity?
A) A
C) C
B) B
18. What is the wet-bulb temperature when the air
temperature is 16ºC and the relative humidity is
71%?
A) 11ºC B) 13ºC C) 3ºC
D) 19ºC
D) D
19. What is the relative humidity of a sample of air that
has a dry-bulb temperature of 20ºC and a wet-bulb
temperature of 11ºC?
A) 9%
B) 2%
C) 17% D) 30%
Relative Humidity, Dew Point,
20. Which station model shows the correct form for indicating a northwest wind at 25 knots and an air
pressure of 1023.7 mb?
A)
B)
C)
D)
21. A weather station model is shown below.
24. The diagram below shows dry-bulb and wet-bulb
temperature readings for a parcel of air.
What is the barometric pressure indicated by this
station model?
A) 0.029 mb
C) 1002.9 mb
B) 902.9 mb
D) 1029.0 mb
22. A sling psychrometer shows a dry-bulb reading of
14°C and a wet-bulb reading of 9°C. What are the
dewpoint and the relative humidity?
A) -10°C and 16%
C) 4°C and 16%
B) -10°C and 50%
D) 4°C and 50%
23. A student used a sling psychrometer to measure the
humidity of the air. If the relative humidity was 65%
and the dry-bulb temperature was 10°C, what was
the wet-bulb temperature?
A) 5°C
B) 7°C
C) 3°C
D) 10°C
What is the dewpoint of the air?
A) 27°C B) 10°C C) 3°C
D) –5°C
Answer Key
Relative Humidity Dew Point Quiz
1.
D
2.
B
3.
C
4.
C
5.
B
6.
D
7.
D
8.
C
9.
A
10.
B
11.
B
12.
B
13.
B
14.
B
15.
B
16.
A
17.
C
18.
B
19.
D
20.
B
21.
C
22.
D
23.
B
24.
C