Pollution:
1. Any undesirable change in physical characteristics of air, land water and soil
2. Any undesirable change in biological characteristics of air, land water and soil
3. Any undesirable change in physical, chemical and biological characteristics of air, land water and soil
4. Any undesirable change in physical and chemical characteristics of air, land water and soil

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Agents that bring undesirable change in biological, physical and chemical environment is called

  1. Pollutant
  2. Bioparcy
  3. Bioinformatics
  4. Biomagnification
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The act to control environmental pollution is passed by Government of India is

  1. Environment Pollution Act-1981
  2. Environment Pollution Act-1986
  3. Environment Protection Act-1986
  4. Environment Protection Act-1981
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Environment Protection Act protects and improves the quality of

  1. Air
  2. Water
  3. Soil
  4. All of these
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Harmful effects of Air pollutants depend upon

  1. Organism exposed
  2. Duration of exposure
  3. Concentration of pollutants
  4. All of these
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Smokestacks of thermal power plants, smelters and other industries release

  1. Particulate air pollutant
  2. Gaseous air pollutant
  3. Harmful gases
  4. All of these
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The particulate matter in exhaust from industries can be removed by

  1. Electrostatic Precipitator
  2. Scrubber
  3. Both of these
  4. Cannot be removed
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Which of the following is not true about electrostatic precipator?

  1. It can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant
  2. Electrode wires maintained at thousand volts, which produce a corona that release electrons
  3. The protons are attached to dust particle give them a net positive charge
  4. The collecting plates attract the dust particles
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Electrostatic Precipitator has

  1. An instruction of low velocity of air between the plates
  2. An instruction of high velocity of air between the plates to allow rapid fall of dust particles
  3. An instruction of no air between plates so that charge may not get disturbed
  4. Both A and C
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Scrubber

  1. Can remove only sulphur dioxide
  2. Can remove gases like sulphur dioxide
  3. Can remove harmless gases
  4. Mix harmless gases with gaseous pollutants
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