Olympiad – Class VIII – Science - Che - Pollution of Air and Water

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Question - 1

The pie chart given below shows the composition of different gases in air.

Identify gases W, X and Y.

  • A W X Y Nitrogen Rare gases Oxygen
  • B W X Y Carbon Oxygen Rare gases
  • C W X Y Nitrogen Oxygen Rare gases
  • D W X Y Rare gases Hydrogen Oxygen

Question - 2

Which of the following air pollutants is wrongly matched with the effect it causes?

  • A Dust - reduces photosynthesis in green plants.
  • B Carbon monoxide - reduces oxygen in the blood
  • C Chlorofluorocarbons - damages nerves and tissues.
  • D Nicotine - hardens and narrows blood vessel

Question - 3

Which of the following does NOT cause air pollution?

  • A Increasing forest reserves
  • B Using pesticides in farms
  • C Developing housing estates
  • D Quarrying for limestone

Question - 4

Which of the following is NOT a general pollutant of atmosphere?

  • A CO2
  • B S02
  • C S03
  • D N02

Question - 5

Identify the gas associated with greenhouse effect

  • A Carbon dioxide
  • B Oxygen
  • C Nitrogen dioxide
  • D Sulphur dioxide

Question - 6

What is the outcome of the release of carbon particles and smoke from factories?

  • A Increases the rate of respiration in plants.
  • B Decreases the rate of photosynthesis in plants.
  • C Increases the absorption of carbon dioxide by plants.
  • D Decreases the rate of transpiration in plants

Question - 7

Which of the following gases can result in the formation of acid rain?

  • A Ozone
  • B Carbon monoxide
  • C Sulphur dioxide
  • D Chlorofluorocarbon

Question - 8

Heat is reflected from the earth's surface and trapped in the atmosphere. Which phenomena is being referred to?

  • A Global warming
  • B Ozone depletion
  • C Greenhouse effect
  • D Thermal pollution

Question - 9

Which of the water pollutants is INCORRECTLYpaired with the source?

  • A Oil spill - ship
  • B Pesticide - oil palm plantation
  • C Sewage - factories
  • D Nitrate - farm

Question - 10

Which of the following gases is regarded as an atmospheric pollutant?

  • A O2
  • B 03
  • C S02
  • D N2