Chapter 6: Practice Quiz

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If the air temperature is 20 °C and the vapor pressure has the same value as the saturation vapor pressure, the relative humidity is

100%.

If the mixing ratio of a parcel of air is 2 grams per kilogram and its saturation mixing ratio is 6 grams per kilogram, the relative humidity is ______ percent.

33.3

As an unsaturated (clear) parcel of air ascends dry adiabatically, Its relative humidity increases. Its saturation vapor pressure decreases. Its temperature drops. All of the above are correct.

All of the above are correct.

As unsaturated (clear) air flows down the leeward slopes of a mountain range, The air temperature rises. The relative humidity decreases. The saturation vapor pressure increases. All of the above are correct.

All of the above are correct.

If a saturated (cloudy) air parcel is heated (say by absorption of radiation), its relative humidity ______.

Decreases

If the temperature of an unsaturated (clear) air parcel does not change while its mixing ratio increases, the density of the parcel ______.

Decreases

A relatively warm surface tends to ______ the overlying air.

Destabilize

As the temperature of a saturated (cloudy) air parcel falls, its relative humidity ______.

Does not change

Rising parcels of saturated (cloudy) air do not cool as rapidly as rising parcels of unsaturated (clear) air because

Expansional cooling of saturated air is partially compensated for by release of latent heat that accompanies cloud formation.

On a clear and calm day, the relative humidity usually ______ between sunrise and early afternoon.

Falls

As the difference between the dewpoint and the ambient air temperature decreases, the relative humidity __________.

Increases

In winter, the precipitable water is likely to have its highest value in ________.

Miami, FL

In the global water budget, annual precipitation is greater than annual evapotranspiration

On the continents.

Conditional stability indicates that an air layer is

Unstable for saturated and stable for unsaturated air parcels.

Cumulus clouds are more likely to form over

Vegetated land surface in summer.


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