Power Systems
Radio interference occur in telecommunication line due to

 both 1 and 2
 electro magnetic induction
 electro static induction
 nether 1 nor 2

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Power Systems
Half life is defined as

 none of above.
 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.

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