CBSE Questions for Class 8 Chemistry Pollution Of Air And Water Quiz 8 - MCQExams.com

__________ used as refrigerants and aerosol propellants are also greenhouse gases.
  • Perfluorocarbons
  • Sulfur hexafluoride
  • Chlorofluorocarbons (CFCs)
  • None of above
Global warming leads to:
  • increase in actual temperature of earth
  • decrease in actual temperature of earth
  • no change in temperature
  • change in pressure
Which of the following is a cause of Ganga river pollution?
  • Industrialization
  • Volcanic eruptions
  • Forest fires
  • All of above
The chemical released in the Ganga river is:
  • arsenic
  • lead
  • fluorides
  • all of above
Water pollution can be caused due to:
  • chemicals
  • sewage
  • silt
  • All of the above
Which of the following is a factor that affect the degree to which any greenhouse gas will influence global warming?
  • Its abundance in the atmosphere.
  • How long it stays in the atmosphere.
  • Its global-warming potential.
  • All of above.
Which of the following is the most common household method for water purification?
  • Boiling
  • Chlorination
  • Coagulation
  • All of above
_____ can be added to water to kill certain bacteria.
  • Sulphur
  • Chlorine
  • Phosphorus
  • Sodium
What are the properties of potable water?
  • Free from harmful contaminants
  • Replenished with natural minerals
  • Alkaline pH balanced
  • All of the above
What is potable water?
  • Contaminated water
  • Drinking water
  • Water with high mineral content
  • Water with low mineral content
Among the following, the one which is not a 'greenhouse gas', is:
  • Carbon dioxide
  • Sulphur dioxide
  • Methane
  • Nitrogen
Reducing the use of plastic can help in reducing water pollution. True or false?
  • True
  • False
Which of the following is not a greenhouse gas?
  • Carbon dioxide
  • Sulphur dioxide
  • Methane
  • Nitrogen
High concentrations of carbon monoxide $$(CO)$$:
  • reduces capacity of blood transport
  • reduces capacity of oxygen transportation through blood in body
  • increases capacity of oxygen transportation through blood in body
  • does not have any effect on body
Exhaust motor vehicle is the main source of:
  • Carbon dioxide
  • Carbon monoxide
  • Sulfur dioxide
  • Nitrogen oxide
Which one of the following sets contribute to the global warming?
  • $$SO_2 ,\, SO_3,\,O_2$$
  • $$N_2 ,\,C_2H_6 ,\, SO_3$$
  • $$CO_2 ,\,CH_4 ,\,CFCs$$
  • $$H_2 ,\,NO_2 ,\, SO_2$$
Which one of the following is not a green-house gas? 
  • $$CO_2$$
  • $$N_2O$$
  • Water vapor
  • $$N_2$$
Which gas has the highest partial pressure in atmosphere?
  • $$CO_2$$
  • $$H_2O$$
  • $$O_2$$
  • $$N_2$$
Which chemical substance is a greenhouse gas that scientists link to global climate change?
  • Nitrogen oxides
  • Lead
  • Pesticides
  • DDT
  • Nitrates
Thermal pollution causes a decrease in dissolved oxygen.
  • True
  • False
Global warming is a serious outcome of:
  • water pollution
  • land pollution
  • industrial pollution
  • none of the above
Combustion can not take place without:
  • water
  • carbon
  • air
  • zinc
Use of pesticides decreases water pollution.
  • True
  • False
Which of these statements are true about air?
(i) Air is a mixture of several types of gases.
(ii) Air exerts pressure.
(iii) The composition of air is constant in the atmosphere.
  • (i) and (ii)
  • (ii) and (iii)
  • (i) and (iii)
  • (i), (ii) and (iii)
Main constituent in air is:
  • nitrogen
  • oxygen
  • argon
  • water vapor
Contamination of water bodies when pollutants are directly or indirectly discharged into water bodies without adequate treatment to remove harmful components is called_____________.
  • water pollution
  • chemical pollution
  • air pollution
  • none of the above
If heat radiated from the earth's surface is retained, outcome will be:
  • formation of smog
  • green house effect
  • van der waals forces of attraction among smoke particles
  • all of these
Industrial plants should be based on recycling operations as it helps to prevent disposal of wastes into natural waters but also extraction of products from waste. This measure is for _________.
  • air pollution
  • land pollution
  • water pollution
  • None of the above
Which of them are water pollutants?
  • Sewage
  • Industrial effluents and chemicals
  • Oil and other wastes
  • All of the above
Ozone hole is maximum spread over:
  • Europe
  • Antartica
  • India
  • Africa
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