Nuclear Power Plants

71. The number of isotopes of hydrogen are

1. 1
2. 2
3. U
4. 3
5. 0

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72. The presence of reflector in nuclear power plants results in

1. increased production of neutrons
2. complete absorption of neutrons
3. controlled production of neutrons
4. decreased leakage of neutrons
5. decrease of speed of neutrons.

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73. The process by which a heavy nucleus is splitted into two light nuclei is known as

1. splitting
2. fission
3. fusion
4. disintegration
5. chain reaction.

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74. The risk of radioactive hazard is greatest in the turbine with following reactor

1. pressurised water
2. boiling water
3. gas cooled
4. liquid metal cooled
5. all of the above.

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75. The size of the reactor is said to be critical when

1. chain reaction can be initiated
2. it becomes uncontrollable
3. it explodes
4. it produces no power
5. it produces tremendous power.

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76. The total energy released in fission of U is

1. 5 MeV
2. 10 MeV
3. 199 MeV
4. 168 MeV
5. 11 MeV.

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77. The unit of radio-activity is

1. electron-volt
2. electron-ampere
3. curie
4. MeV
5. AMU.

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78. U235 will undergo fission by

1. high energy (fast) neutrons alone
2. low energy (slow) neutrons alone
3. either fast or slow neutrons
4. medium energy neutrons
5. none of the above.

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79. U238 will undergo fission by

1. high energy (fast) neutrons alone
2. low energy (slow) neutrons alone
3. either fast or slow neutrons
4. medium energy neutrons
5. none of the above.

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80. Uranium-233 is produced

1. as basic raw material
2. by neutron irradiation of Uz
3. by neutron irradiation of thorium
4. artificially
5. in high capacity furnaces.

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