WHO’s recommendations about the industrial noise limit is of :
  • 105 dB
  • 75 dB
  • 135 dB
  • 165 dB

B.

75 dB
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Which of the following pollutants is not produced by exhaust of motor vehicles ?
  • CO
  • Hydrocarbon
  • Fly-ash
  • NO

C.

Fly-ash
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The meaning of BOD is :
  • Bacterial oxygen demand
  • Biological optimum density
  • Biochemical oxygen demand
  • Bioorganisation decay


C.

Biochemical oxygen demand
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What is the term for the inflammation of cornea due to high absorption of UV-B radiation :
  • myopia
  • snow blindness
  • biomagnification
  • None of the above

B.

snow blindness
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Smog is a mixture of  :
  • Aluminium ions
  • Methane and ozone
  • smoke and fog
  • water and smoke

C.

smoke and fog
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