In the breeder reactor, uranium-235 core is covered with a blanket of:

1. uranium-238
2. plutonium-239
3. polonium-210
4. protactinium-234
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Answer: A
Explanation:
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In the breeder reactor, blanket of uranium-238 after absorbing neutron released by the core, is converted to:

1. uranium-235
2. plutonium-239
3. polonium-210
4. protactinium-234
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Answer: B
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The fusion reaction occurs at a temperature of about:

1. 1 Million ℃

2. 10 Million ℃

3. 100 Million ℃

4. 2 Million ℃

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Answer: C
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In the fusion reaction, the mass of reacting nuclei is:

1. less than that of the nucleus formed
2. greater than that of the nucleus formed
3. both a & b may be corrct
4. equal to that of the nucleus formed
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Answer: B
Explanation:
• The mass that lost is converted into a lot of energy.
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The fusion reaction involves which state of matter?

1. solid
2. liquid
3. gas
4. plasma
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Answer: D
Explanation:
• Since fusion reaction occurs at very high temperature.
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Due to fusion reaction, every second the sun loses its mass of about:

1. 4.3 x 10⁹ kg
2. 420 kilotons
3. both a and b
4. 340 x 10⁸ kg
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Answer: C
Explanation:
• This mass is converted to energy, but the total mass of sun is so great that its loss of mass is imperceptible.
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Hydrogen bomb makes use of which nuclear reaction?

1. fission reaction
2. fusion reaction
3. both a and b
4. transmutation
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Answer: C
Explanation:
• Hydrogen-bomb makes use of fusion reaction of the isotopes of hydrogen. But it also consists of a small U-235 or Pu-239 fission bomb as primary stage. In the secondary stage nuclear fusion reaction occurs.
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Which of the followings can be used as fuel in the hydrogen bomb?

1. deuterium
2. tritium
3. lithium deuteride
4. all of these
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Answer: D
Explanation:
• All of these can be used. Modern fusion weapons make use of lithium deutride.
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Which type of decay might convert Pb-214 to Bi-214?

1. alpha decay
2. beta decay
3. gamma decay
4. none of these
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Answer: B
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Ra-226 after alpha-decay will yield:

1. Rn-222
2. Th-230
3. Fr-222
4. Th-222
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Answer: A
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