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  1. Nuclear reactors are used

  2. A.

     To produce heat for thermoelectric power

    B.

     To produce fissionable material

    C.

     To propel ships, submarines, aircrafts

    D.

     All of these

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  3. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is

  4. A.

     Same

    B.

     Lower

    C.

     Higher

    D.

     Unity

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  5. The energy produced by a thermal reactor of same size as a breeder reactor is

  6. A.

     Almost same

    B.

     Slightly more

    C.

     Slightly less

    D.

     Much less

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  7. In natural uranium, the constituents of three naturally occurring isotopes are

  8. A.

     U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%

    B.

     U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

    C.

     U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%

    D.

     U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%

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  9. The main interest of shielding in nuclear reactor is protection against

  10. A.

     X-rays

    B.

     Infrared rays

    C.

     Neutrons and gamma rays

    D.

     Electrons

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  11. Ferrite material is

  12. A.

     The most fissionable material

    B.

     The basic fuel for nuclear paints

    C.

     Basic raw material for nuclear plants

    D.

     The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

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  13. Enriched uranium may contain fissionable contents of the order of

  14. A.

     1-99%

    B.

     1-25%

    C.

     1-50%

    D.

     1-75%

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  15. A reactor capable of converting a ferrite material into fissile isotopes is called

  16. A.

     Regenerative reactor

    B.

     Fast breeder reactor

    C.

     Breeder reactor

    D.

     Boiling water reactor

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  17. In the breeder reactors the generation of new fissionable atom is

  18. A.

     At the lower rate than the consumption

    B.

     At a higher rate than the consumption

    C.

     At an equal rate of the consumption

    D.

     Depends on other considerations

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  19. The nuclear radiators produced in a reactor which must be shielded are

  20. A.

     Electrons

    B.

     α, β and γ rays

    C.

     Neutron and gamma rays

    D.

     None of these

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