Power Systems
Operating cost of thermal power station is

  less than that of diesel power plant.
 is the same as that of nuclear power plant.
 less than that of nuclear power plant.
 less than that of hydroelectric power plant.

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Power Systems
Half life is defined as

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

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