Physics
WAEC 1993
Which of the following is used a nuclear reactor to slow down fast moving neutrons?
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A.
Carbondioxide gas
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B.
Liquid sodium metal
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C.
Concrete shield
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D.
Graphite rods
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E.
Boron rods
Correct Answer: Option D
Explanation
The uses of graphite:
- Used in making a pencil.
- Used as a dry lubricant.
- For making electrodes.
- For polishing iron articles.
- As a moderator in the nuclear furnace.
The moderator of a nuclear reactor is a substance that slows neutrons down.
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