The second nuclear weapon used in warfare over Nagasaki, Japan, on august 9, 1945 is also called:

1. thermonuclear bomb
2. hydrogen bomb
3. gadget
4. Fat man
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Answer: D
Explanation:
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The second nuclear weapon used in warfare over Nagasaki, Japan, contains which type of nuclear weapon?

1. plutonium
2. uranium
3. both a & b
4. Polonium
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Answer: A
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The second nuclear weapon used in warfare over Nagasaki, Japan, contains energy equal to about ------ of TNT?

1. 1000 kilotons
2. 15000 tons
3. 8 kilotons
4. 20 kilotons
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Answer: D
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In the nuclear reactor, the moderator which slows down neutrons may contain:

1. light water
2. heavy water
3. graphite rods
4. all of these
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Answer: D
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In the nuclear reactor, the control rods which control the rate of fission of U-235 are made of:

1. boron
2. cadmium
3. boron or cadmium
4. graphite
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Answer: C
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In the nuclear reactor, Boron-10 after absorbing the slow neutron is converted to:

1. Li-7 and He-4
2. Li-6 and He-5
3. Be-9 and deuterium
4. C-12 and proton
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Answer: A
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The coolant which removes heat produced by fission in the nuclear reactor is:

1. D₂O
2. H₂O
3. both a & b
4. cadmium rods
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Answer: C
Explanation:
• Both light and heavy water can be used as coolant, but heavy water(D₂O) is more efficient.
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In the nuclear reactor, water serves as:

1. coolant
2. moderator
3. both a & b
4. fission reaction controller
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Answer: C
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The most commercial nuclear power plants today are:

1. heavy-water reactor
2. light-water reactor
3. both a & b
4. none of these
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Answer: B
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The nuclear reactor that produces more fissionable material than it consumes to generate the energy is called:

1. breeder reactor
2. thermal-neutron reactor
3. batch reactor
4. plug flow reactor
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Answer: A
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