* not completed

. Which term refers to the formation of water droplets on a nucleus?

Heterogeneous nucleation correct incorrect

The curvature effect correct incorrect

Homogeneous nucleation correct incorrect

The solute effect correct incorrect

* not completed

. Which of the following is NOT an example of a hygroscopic aerosol?

Sea salt correct incorrect

Ozone correct incorrect

Sulphuric acid correct incorrect

Nitric acid correct incorrect

* not completed

. Droplets that reach the peak of their Kohler curve are known as what?

Stable correct incorrect

Activated correct incorrect

Unstable correct incorrect

Hygroscopic correct incorrect

* not completed

. At what temperature will there be only ice crystals in a cloud?

Below -10°C correct incorrect

Below -20°C correct incorrect

Below -30°C correct incorrect

Below -40°C correct incorrect

* not completed

. Which of the following is NOT a method that results in the formation of clouds?

Air rising from the surface by convection correct incorrect

Air pulled up from the surface when convergence occurs aloft correct incorrect

Orographic uplift correct incorrect

Frontal lifting correct incorrect

* not completed

. The name of which cloud form means "rain"?

Cumulus correct incorrect

Cirrus correct incorrect

Nimbus correct incorrect

Stratus correct incorrect

* not completed

. Which cloud is typically found at the lowest elevation?

Cirrocumulus correct incorrect

Altostratus correct incorrect

Cirrus correct incorrect

Stratocumulus correct incorrect

* not completed

. Fall streaks are associated with which cloud?

Cirrus correct incorrect

Stratocumulus correct incorrect

Cumulonimbus correct incorrect

Nimbostratus correct incorrect

* not completed

. Which of the following statements about fog is NOT true?

It dissipates from the top down. correct incorrect

Radiation fog is most common in fall. correct incorrect

Advection fog tends to be deeper than radiation fog. correct incorrect

Precipitation fog is also referred to as frontal fog. correct incorrect

* not completed

. Which fog forms when water vapour evaporating from a warm, moist surface is mixed into colder air above that surface?

Advection correct incorrect

Radiation correct incorrect

Steam correct incorrect

Upslope correct incorrect

* not completed

. Water droplets spontaneously form when relative humidity reaches 100 per cent.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. A curved surface requires a higher saturation vapour pressure than does a flat surface in order to be in equilibrium with the surroundings.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Cumulonimbus clouds are the only clouds that extend throughout the troposphere.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Cirriform clouds can cause haloes to appear around the sun or the moon.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Cloudy skies and strong winds are favourable conditions for the development of radiation fog at night.

TRUE correct incorrect

FALSE correct incorrect