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

  • A
    Collection plate
  • B
    Negatively charged wire
  • C
    Dust particles
  • D
    Dischargers

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In the last few decades,the most serious nuclear reactor accident and the $MIC$ gas tragedy occurred in:

Arrange the following in ascending order based on their $BOD$ value:
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The greater $BOD$ of waste water relates to:

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