Natural Hazards: Causes and Effects - Disaster Management Center ...

Lesson 5 - Self-Assessment Test
Multiple Choice
Circle the best answer(s):
1. The difference between a harmless
thunderstorm and a cyclone is:
a) vorticity
b) Coriolis effect
c) the doldrums
d) the direction of spin
e) negative climatic depressions
2. The percent of tropical depressions that
become cyclones is:
a) 60 percent
b) 70 percent
c) 80 percent
d) 90 percent
e) 33 percent
3. A tropical depression becomes a
tropical storm when:
a) its winds reach 120 kilometers per
hour
b) its winds reach 62 kilometers per
hour
c) its winds reach 82 kilometers per
hour
d) its winds contract into a 50
kilometer circle
e) its winds widen to a 50 kilometer
storm front
4. Cyclones cannot develop when the
ocean temperature is below 24 degrees
Centigrade (76°F) because:
a) of insufficient heat
b) of insufficient temperature
difference between the air and
water
c) cooler water temperatures prevent
doldrums
d) of insufficient evaporation
e) thunderstorm seedlings are unable
to form
5. When two wind currents travel side by
side, the faster current:
a) curls away from the slower one
b) curls away from the vorticity of the
earth’s force
c) curls in the directon of the earth’s
rotation
d) curls around the slower one
e) creates trade winds in the
equatorial trough
6. Wind velocity is measured:
a) on the Saffir/Simpson scale.
b) by the National Hurricane Center in
the Hawaiian Islands.
c) on the Richter scale.
d) by the Seamen’s Multinational Wind
Bureau.
e) on the Beaufort scale.
7. Tropical cyclones often generate:
a) high rates of injured people
b) tidal floods
c) very heavy rainfall
d) agricultural soil erosion
e) countercurrents beneath the
ocean’s surface
8. Modern technology usually first
identifies and follows a cyclone using:
a) World Weather Watch
b) satellite photos
c) weather radar
d) automatic weather stations