What is the intensity of sound in normal conversation?

  • A
    $10-20 dB$
  • B
    $40-60 dB$
  • C
    $90-120 dB$
  • D
    $120-150 dB$

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The process of aging of a lake by human activities occurs at a very rapid rate,which is called......

The first commercial pesticide was:

Discuss the following in brief:
$(a)$ Greenhouse gases
$(b)$ Catalytic converters
$(c)$ Ultraviolet-$B$ $(UV-B)$

$CO$ is highly hazardous to animal health,but on plants,this gas does not seem to show adverse effects.

Provide the full forms of the following abbreviations:
$(i)$ $GAIL$
$(ii)$ $BOD$

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