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  1. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

  2. A.

     Heavy water

    B.

     Graphite

    C.

     Carbon dioxide

    D.

     No moderator is needed

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  3. A fission chain reaction in uranium can be developed by

  4. A.

     Slowing down fast neutrons so that Uz fission continues by slow motion neutrons

    B.

     Accelerating fast neutrons

    C.

     Absorbing all neutrons

    D.

     Using moderator

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  5. The total energy released in fission of U is

  6. A.

     5 MeV

    B.

     10 MeV

    C.

     199 MeV

    D.

     168 MeV

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  7. In nuclear fission

  8. A.

     The original elements change into completely different elements

    B.

     The electrons of the element change

    C.

     The molecules rearrange themselves to form other molecules

    D.

     None of the above

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  9. The energy required to be applied to a radioactive nucleus for the emission of a neutron is

  10. A.

     1 MeV

    B.

     2.4 MeV

    C.

     4.3 MeV

    D.

     7.8 MeV

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  11. Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal

  12. A.

     Centrifugal

    B.

     Axial

    C.

     Reciprocation

    D.

     Electromagnetic

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  13. Artificial radioactive isotopes find application in

  14. A.

     Power generation

    B.

     Nucleonic devices

    C.

     Nuclear fission

    D.

     Medical field

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  15. U235 will undergo fission by

  16. A.

     High energy (fast) neutrons alone

    B.

     Low energy (slow) neutrons alone

    C.

     Either fast or slow neutrons

    D.

     Medium energy neutrons

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  17. U238 will undergo fission by

  18. A.

     High energy (fast) neutrons alone

    B.

     Low energy (slow) neutrons alone

    C.

     Either fast or slow neutrons

    D.

     Medium energy neutrons

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  19. A nuclear unit becoming critical means

  20. A.

     It is generating power to rated capacity

    B.

     It is capable of generating much more than rated capacity

    C.

     There is danger of nuclear spread

    D.

     Chain reaction that causes automatic splitting of the fuel nuclei has been established

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