CBSE Questions for Class 8 Chemistry Pollution Of Air And Water Quiz 5 - MCQExams.com

The percentage of nitrogen and oxygen in air is:
  • 21% by volume
  • 50% by weight
  • 37% by weight
  • 99% by volume
  • 29% by volume
Which one of the following gas does not form a part of the atmosphere?
  • Nitrogen
  • Chlorine
  • Carbon dioxide
  • Oxygen

Global warming is the result of the increase in ________ in air.
  • nitrogen
  • oxygen
  • water vapour
  • carbon dioxide
Sometimes it may be necessary to disinfect water with chemicals like ______ before releasing it into the distribution system.
  • chlorine
  • ozone
  • Both A and B
  • none of the above
Potable water is fit for human consumption.
  • True
  • False

The correct ascending order of gases as per their composition in air is:
  • oxygen < carbon dioxide < nitrogen
  • hydrogen < oxygen < nitrogen
  • nitrogen < hydrogen < oxygen
  • oxygen < carbon dioxide < hydrogen
Which component of the cooked food should not be disposed off into the drain?
  • Dry vegetables
  • Oil/ghee
  • Supernatent liquid
  • None of the above

Which of the following gases cause the harmful greenhouse effect?
  • Hydrogen
  • Oxygen
  • Carbon dioxide
  • Nitrogen
Select the correct option among the following.
  • Cooking oil and fats should be thrown down the drain.
  • Chemicals like paints, solvents, insecticides, motor oil, medicines may kill microbes that help purify water.
  • Used tea leaves, solid food remains, soft toys, cotton, sanitary towels etc. should not be thrown in the dustbin.
  • None of the above
Which of the following is not a water pollutant?
  • Metal nitrates
  • Sewage
  • Oxygen
  • Human excreta
Carbon dioxide is the major component of greenhouse gases.
  • True
  • False
What is the major constituent of air?
  • Hydrogen
  • Oxygen
  • Nitrogen
  • Water vapour
Which of the following is not a green house gas?
  • Carbon dioxide
  • Water vapour
  • Oxygen
  • Methane
Solutions for air pollution is/are:
  • use of public mode of transportation
  • conservation of energy
  • adoption of the concept of reduce, reuse and recycle
  • All of the above
Carbon dioxide constitutes nearly ___ % of the atmosphere.
  • 45
  • 78
  • 21
  • 0.03
Which one of the following is not a green house gas?
  • $$CO_{2}$$
  • $$H_{2} O$$
  • $$N_{2}$$
  • $$O_{3}$$
Which of the following is not a constituent of the atmosphere?
  • Oxygen
  • Nitrogen
  • Carbon dioxide
  • Manganese dioxide
Carbon dioxide and methane are the two major components of greenhouse.
  • True
  • False
Carbon dioxide, argon, methane, ozone and water vapour are also present in  air in:
  • very small quantities
  • very large quantities
  • equal quantities
  • None of these
State whether true or false:
Potable water must be clear and free from disease causing bacteria only.
  • True
  • False
How can we save the environment from degradation by reducing the number of fossil fuels to be burned?
  • By using public mode of transportation
  • By conserving energy
  • By using efficient device
  • All of these
The significant natural causes of air pollution are:
  • volcanic eruptions
  • forest fires
  •  both A and B both
  • none of the above
The ash can cause _______ problems.
  • digestive 
  • reproductory 
  • respiratory 
  • nervous 
The most problematic gases emitted in a volcanic eruption includes :
  • sulphur dioxide
  • carbon dioxide
  • hydrogen fluoride
  • All of the above
The concept of  'Reduce, Reuse and Recycle' helps us to:
  • minimize the dependence on producing new things
  • minimize the amount of waste generated
  • maximize the dependence on producing new things
  • All of the above.
The main reasons for deforestation are:
  • rapid increase in the population of human beings and their livestock
  • urbanization and human settlements
  • cutting down trees for obtaining fuel
  • All of the above
Which gas reduces the oxygen-carrying capacity of the blood?
  • $$CO$$
  • $$CO_2$$
  • $$NO_2$$
  • $$SO_2$$
What does CNG mean?
  • Compressed Natural Gas
  • Coal Natural Gas
  • Carbon Natural Gas
  • Carbon Nitrogen Gas
The major causes of man-made air pollution are: 
  • burning oil
  • coal
  • gasoline
  • all of the above
All forest fires emit(s):
  • carbon monoxide
  • sulphur dioxide
  • nitrogen dioxide
  • all of the above
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