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  1. The predominant isotope of the naturally occurring element is

  2. A.

     U₂₃₅

    B.

     U₂₃₈

    C.

     Pu₂₃₃

    D.

     Pu₂₃₉

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  3. A nuclear fission produces energy of following order in MeV

  4. A.

     20

    B.

     200

    C.

     2000

    D.

     20,000

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  5. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is

  6. A.

     Same

    B.

     More

    C.

     Less

    D.

     There is no such criterion

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