Power Systems
Half life is defined as

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

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Power Systems
An hydro-graph indicates

 the average run off during the period.
 the maximum and minimum run off during the period.
All of these
 the discharge at any time during the period under consideration.

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