* not completed

. The presence of which of the following conditions will NOT increase the chances of collision and coalescence?

Electric fields correct incorrect

Deep clouds with strong updrafts correct incorrect

A variety of droplet sizes correct incorrect

Collector droplets smaller than 20 µm in radius correct incorrect

* not completed

. Which of the following is NOT one of the steps involved in the formation of raindrops in warm clouds?

Diffusion correct incorrect

Crystallization correct incorrect

Nucleation correct incorrect

Collision and coalescence correct incorrect

* not completed

. Which of the following statements about the Bergeron-Findeisen process is false?

The process only occurs in cold clouds. correct incorrect

All precipitation forming by this process begins as ice crystals. correct incorrect

It requires supercooled water droplets and ice crystals to coexist in clouds. correct incorrect

Water vapour diffuses from the ice crystals to the water droplets. correct incorrect

* not completed

. Precipitation that falls into very dry air and completely evaporates before reaching the ground will produce what?

Drizzle correct incorrect

Virga correct incorrect

Graupel correct incorrect

Ice crystals correct incorrect

* not completed

. Which type of precipitation is most likely to fall when a warm layer of air at least 200 metres deep overlies a cold surface layer of air that is less than 250 meters deep?

Freezing rain correct incorrect

Sleet correct incorrect

Hail correct incorrect

Snow correct incorrect

* not completed

. Which type of precipitation is often responsible for power outages due to the weight easily breaking tree branches and electrical wires?

Sleet correct incorrect

Freezing rain correct incorrect

Graupel correct incorrect

Hail correct incorrect

* not completed

. For hail to be considered severe, how large must hailstones be?

Larger than 5 mm correct incorrect

Larger than 1 cm correct incorrect

Larger than 2 cm correct incorrect

Larger than 5 cm correct incorrect

* not completed

. What are the most important measurements to take before determining if conditions are right to make snow?

Air temperature and dew-point temperature correct incorrect

Dew-point temperature and mixing ratio correct incorrect

Vapour pressure and wet-bulb temperature correct incorrect

Air temperature and wet-bulb temperature correct incorrect

* not completed

. Which type of precipitation most commonly occurs on warm afternoons?

Orographic correct incorrect

Frontal correct incorrect

Convectional correct incorrect

Graupel correct incorrect

* not completed

. Due to the fact that it receives a balance of frontal precipitation in the winter and convectional precipitation in the summer, which city has a relatively even distribution of precipitation throughout the year?

Montreal correct incorrect

Winnipeg correct incorrect

Vancouver correct incorrect

Prince Rupert correct incorrect

* not completed

. The terminal velocity of a water droplet increases with its size.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. If there is a large difference in size between cloud droplets, it is unlikely that they will collide.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Hail is frozen precipitation that results from growth by aggregation.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. If the air is very dry, it may be possible for snow machines to make snow even when temperatures are above freezing.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Frontal systems are the major producers of precipitation in the mid-latitudes.

TRUE correct incorrect

FALSE correct incorrect