Power Systems
Critical mass of the fuel is the amount required to make the multiplication factor

  equal to factor.
 0.5.
 more than 1.
 less than 1.

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Power Systems
Half life is defined as

 the time required to spiliting of a heavy nucleus.
 the time required for full of atoms in a specimen disintegrate.
 none of above.
  the time required for one half of isotope to decay.

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