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WX 201 Exam 2 Questions and Correct
Answers
At what time of day is the relative humidity normally at a
minimum? Ans: when the air temperature is highest
The time of day when the relative humidity reaches a maximum
value is usually Ans: at the time when the air temperature is
lowest.
The instrument that measures humidity by measuring the amount
of radiant energy absorbed by water vapor is the Ans: infrared
hygrometer.
The relationship between the mass of water vapor in an air parcel
and the mass of all air in the same parcel (including vapor) is
called ____. Ans: specific humidity
The mass of water vapor in a given volume of air is called ____.
Ans: absolute humidity
The heat index (HI) is used by the National Weather Service, and
combines ____ with ____ to determine an apparent temperature.
Ans: air temperature; relative humidity
The lowest temperature that can be attained by evaporating water
into the air is known as the Ans: wet-bulb temperature.
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, 2 | Page
Which of the following will increase the relative humidity in a
home during the winter? Ans: taking a shower and letting the air
circulate through the home
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 Ans: mixing
ratio.
____ law of partial pressure describes that the total pressure inside
an air parcel is equal to the sum of all pressures of the individual
gases present in the air parcel. Ans: Dalton's
On a warm and windy day evaporation will be ____. Ans: High
The density of water vapor in a given parcel of air is represented
by the Ans: absolute humidity.
Which of the following is the BEST indicator of the actual amount
of water vapor in the air? Ans: dew point temperature
This instrument uses wet-bulb and dry-bulb temperature to obtain
relative humidity: Ans: sling psychrometer
A high water vapor pressure indicates a(n) Ans: relatively large
number of water vapor molecules in the air.
As the difference between the air temperature and the dew point
increases, the relative humidity Ans: decreases.
© 2025 All rights reserved
WX 201 Exam 2 Questions and Correct
Answers
At what time of day is the relative humidity normally at a
minimum? Ans: when the air temperature is highest
The time of day when the relative humidity reaches a maximum
value is usually Ans: at the time when the air temperature is
lowest.
The instrument that measures humidity by measuring the amount
of radiant energy absorbed by water vapor is the Ans: infrared
hygrometer.
The relationship between the mass of water vapor in an air parcel
and the mass of all air in the same parcel (including vapor) is
called ____. Ans: specific humidity
The mass of water vapor in a given volume of air is called ____.
Ans: absolute humidity
The heat index (HI) is used by the National Weather Service, and
combines ____ with ____ to determine an apparent temperature.
Ans: air temperature; relative humidity
The lowest temperature that can be attained by evaporating water
into the air is known as the Ans: wet-bulb temperature.
© 2025 All rights reserved
, 2 | Page
Which of the following will increase the relative humidity in a
home during the winter? Ans: taking a shower and letting the air
circulate through the home
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 Ans: mixing
ratio.
____ law of partial pressure describes that the total pressure inside
an air parcel is equal to the sum of all pressures of the individual
gases present in the air parcel. Ans: Dalton's
On a warm and windy day evaporation will be ____. Ans: High
The density of water vapor in a given parcel of air is represented
by the Ans: absolute humidity.
Which of the following is the BEST indicator of the actual amount
of water vapor in the air? Ans: dew point temperature
This instrument uses wet-bulb and dry-bulb temperature to obtain
relative humidity: Ans: sling psychrometer
A high water vapor pressure indicates a(n) Ans: relatively large
number of water vapor molecules in the air.
As the difference between the air temperature and the dew point
increases, the relative humidity Ans: decreases.
© 2025 All rights reserved
