What does '$X$' represent in the given figure?

  • A
    Dust particles
  • B
    Electrons
  • C
    Discharge corona
  • D
    Lime spray

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$.........$ is an undesirable,high-intensity sound.

What is the $BOD$ level of potable water?

Which of the following is most poisonous?

Provide definitions and explanations for the following terms:
$(i)$ Pollution
$(ii)$ Greenhouse effect

In which one of the following have the $BOD$ (Biochemical Oxygen Demand) of sewage $(S)$,distillery effluent $(DE)$,paper mill effluent $(PE)$,and sugar mill effluent $(SE)$ been arranged in ascending order?

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