Q.The effect of corona can be detected by

  • APresence of ozone detected by odour
  • BHissing sound
  • CFaint luminous glow of bluish colour
  • DAll of the above 
Correct Answer : (D)

All of the above 

Hints :

The effect of corona can be detected by Presence of ozone detected by odour, Hissing sound and Faint luminous glow of bluish colour.

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