Weather Variables Quiz Review

What is the relative humidity of the air when the dry-bulb temperature is 4°C and the dewpoint is -4°C?

• 42%

• 46%

• 51%

• 56%

Most clouds form in the atmosphere when moist air

• rises, expands, and cools to the dewpoint

• rises, expands, and warms to the dewpoint

• sinks, compresses, and cools to the dewpoint

• sinks, compresses, and warms to the dewpoint

Which graph best shows the general relationship between air pressure and altitude?

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A psychrometer is used to determine which weather variables?

• wind speed and wind direction

• percentage of cloud cover and cloud height

• air pressure and air temperature

• relative humidity and dewpoint

Base your answer on the weather map , which shows a low-pressure system over the eastern United States. Letters A through D represent weather stations.

Which station model correctly represents the barometric pressure at station A?

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The incomplete flowchart shows some of the changes that occur in warm air as it rises to form a cloud.

Which statement should be placed in the empty box to accurately complete the flowchart?

• The air warms as it expands.

• The air cools until it reaches the dewpoint.

• The air's relative humidity decreases to zero.

• The air enters the thermosphere.

What is the dewpoint if the dry-bulb temperature is 18°C and the relative humidity is 64%?

• 14°C

• 11°C

• 9°C

• 4°C

A barometric pressure of 1021.0 millibars is equal to how many inches of mercury?

• 29.88

• 30.15

• 30.25

• 30.50

In which two temperature zones of the atmosphere does the temperature increase with increasing altitude?

• troposphere and stratosphere

• troposphere and mesosphere

• stratosphere and thermosphere

• mesosphere and thermosphere

What is the temperature for the following station model?

• 4 ºF

• 76 ºF

• 80 ºF

• 129 ºF