QUESTION: 105

The amount of carbon dioxide in the atmosphere is increasing, therefore contributing to the phenomenon called the greenhouse effect. The end result is an increase in average temperatures worldwide.
A decrease in global warming could result if we reduced the consumption of materials that give off carbon dioxide when burned.

To reduce global warming, what should be used LESS?

fossil fuels
geothermal energy
solar energy
nuclear energy
electricity

Answer(s): A

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QUESTION: 106

When water evaporates from a surface, the surface is cooled. From this information, which of the following would MOST likely keep the human body at a constant temperature?

perspiring more when the body becomes overheated
breathing rapidly on hot days
shivering when the outside temperature is very cold
drinking juices rather than water when exercising
avoiding drinking too much water when exercising

Answer(s): A

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QUESTION: 107

The half-life of a radioactive substance is defined as the time required for one-half of the atoms of a radioactive sample to decay.
Radioactive carbon-14 has a half-life of 5730 years. After 5730 years, an original 2.00 g sample of carbon-14 will decay to 1.00 g.
At the end of a second half-life, how much of the 1.00 gram of carbon-14 will decay?

0.10 g
0.25 g
0.50 g
0.75 g
1.00 g

Answer(s): C

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QUESTION: 108

Windchill is the rate of heat loss on the human body resulting from the combined effects of low temperature and wind. As wind speeds increase, heat is carried away from the body at a faster rate, thus lowering both the skin temperature and, ultimately, the internal body temperature. Many other factors can affect the impact of windchill, such as type of clothing worn, the amount of flesh exposed, and an individual's physical condition.
Based on the information provided, which of these practices would BEST protect a person from the damaging effects of windchill on a severe day?

Dressing as one would at any other time of the year.
Staying close to other people when outdoors.
Staying outdoors as much as possible to get used to the windchill.
Going indoors occasionally to warm up.
Covering all parts of the body with warm, waterproof, and insulated clothing.

Answer(s): E

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