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 advantage of hydro electric power station over thermal power station is

 the operation cost of hydro electric power station is low
 hydro electric station can be constructed at the place where the energy is required
 the initial cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year

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