Power Systems
Radio interference occur in telecommunication line due to

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

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Power Systems
Half life is defined as

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

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