Thunder is caused by:
a. the collision between two thunderstorms with opposite electrical charge
b. the rapid heating of air surrounding a lightning channel
c. the explosion that occurs when + and - charge collide and neutralize each other
d. turbulent wind motions inside the thunderstorm
Q. 2 -
Which of the following is the most accurate description of the principle of a lightning rod?
a. the lightning rod acts to discharge the thunderstorm
b. the lightning rod intercepts the lightning and safely carries the lightning current
around the object it protects
c. lightning rods have been used since the 1700s, but the principle of their
operation is not known.
d. positive charge induced in the lightning rod repels the negative charge in an
approaching step leader
Q. 3 -
You a generally safe inside an automobile during a lighting storm because:a.
the car's radio antenna will act as a lightning rod
b. the rubber tires insulate you from the ground
c. metal cars do not become electrically charged
d. the metal car body will carry the lightning current around the passengers inside
Q. 4 -
An important principle in the electrification of a cumulonimbus cloud is that:a.
raindrops are always positively charged
b. supercooled water is always negatively charged
c. ice crystals are always negatively charged
d. there is a net transfer of positive ions from a warmer object to a colder object
Q. 5 -
The upper part of a thunderstorm cloud is normally __________ charged, and the middle and
lower parts are __________ charged.
a. negatively, negatively
b. negatively, positively
c. positively, positively
d. positively, negatively
Q. 6 -
Lightning may occur:a.
within a cloud
b. from a cloud to the ground
c. from one cloud to another cloud
d. all of the above
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