Power Systems
Half life is defined as

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

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Power Systems
The factor affecting run off are

  all of above.
 the topography and nature of soil in the catchment area.
 amount of vegetation and weather condition in the catchment area.
 rain fall pattern, shape and size of catchment area.

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