AnswersMHS - Physical Science - S1 - CRUnit Test

Unit Test — Unit test Answers

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A sample is in the second half-life. What percent of the sample is stable at this point?

A
12.5%
B
25%
C
50%
D
75%
2
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Three radioisotopes are being discussed in a chemistry class. Technetium-99m has a half-life of 6 hours. Rubidium-87 has a half-life of 50 billion years. Which describes who would most likely use each isotope?

A
A geologist would use technetium-99m because short-life indicates an older organism, and a doctor would use rubidium-87 because it allows for a more-accurate measurement of disease.
B
A doctor would use technetium-99m because a short half-life indicates a quick measurement, and a geologist would use rubidium-87 because a longer half-life means that there is a longer time to measure old rock.
C
A doctor would use technetium-99m because a short half-life indicates a quick measurement, and an archeologist would use rubidium-87 because anything containing carbon also contains rubidium.
D
A geologist would use technetium-99m because a short half-life indicates an older organism, and an archeologist would use rubidium-87 because anything containing carbon also contains rubidium.
3

Which will reduce the possible environmental damage associated with mining uranium?

A
installing newer water recycling systems in older power plants
B
increasing the reprocessing of used fuel for reuse
C
building additional fission nuclear power plants
D
developing better places to store radioactive wastes
4

Which describes radioactive decay of a substance?

A
More of the radioactivity is lost during the first half-life than in later half-lives.
B
More of the radioactivity is lost during the fourth half-life than in the first half-life.
C
Isotopes are the most stable during the first half-life.
D
Isotopes are the least stable during the later half-lives.
5

Which radioactive isotopes did the Curies discover?

A
polonium and radium
B
radium and carbon-14
C
carbon-14 and uranium
D
uranium and polonium
6

Which compares the problems associated with radioactive waste created from generating electricity using fusion reactions to waste created from generating electricity using fission reactions?

A
The radioactive waste from fusion reactions becomes less hazardous much sooner than the waste from fission reactions.
B
The radioactive waste from fission reactions becomes less hazardous much sooner than the waste from fusion reactions.
C
Although their radioactive wastes are hazardous for the same period of time, fusion reactions produce less waste than fission reactions.
D
Although their radioactive wastes are hazardous for the same period of time, fission reactions produce less waste than fusion reactions.
7

A nuclear power plant is scheduled to undergo a retrofitting. What is the most likely outcome of the change?

A
The power plant will no longer generate radioactive wastes.
B
The power plant will recycle the water it uses to cool the reactor.
C
The power plant will be able to reprocess its used uranium fuel.
D
The power plant will switch from fission reactions to fusion reactions.
8

Mateo’s parents are thinking about investing money to help develop a new fusion power plant. Which issue is most important to consider before making the investment?

A
Fusion has never been controlled, so how have they succeeded in doing it?
B
The fuel is quite limited, so have they discovered a more common fuel?
C
Fusion has been generating electricity for decades, so why build another fusion power plant?
D
Fusion requires high temperatures and pressures, so how have they reduced the energy cost for it?

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