CBSE Questions for Class 6 Chemistry Air Around Us Quiz 1 - MCQExams.com

 A gas is colourless, odourless, heavier then air and extinguishes fire, name the gas
  • Nitrogen
  • Carbon dioxide
  • Hydrogen
  • Oxygen
Nitrogen constitutes nearly __ % of the atmosphere.
  • 45
  • 78
  • 21
  • 0.03
Name the gas which has the highest percentage in air.
  • Nitrogen 
  • Oxygen
  • Carbon dioxide
  • Helium
Which of the following is correct about the percentage composition of $$O_2$$ in air?
  • 21%
  • 52%
  • 78%
  • 12.5%
Nitrogen is the major constituent of air.
  • True
  • False
__________ and __________ are the major components of the atmosphere.
  • Nitrogen and argon
  • Carbon dioxide and oxygen
  • Nitrogen and oxygen
  • Oxygen and carbon dioxide
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
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Oxygen constitutes nearly __ % of the atmosphere.
  • 45
  • 78
  • 21
  • 0.03
Plants consume ____________ and give _____________.
  • oxygen, carbon dioxide
  • carbon dioxide, oxygen
  • sulphur dioxide, oxygen
  • oxygen, sulphur dioxide
Air does not occupy any space.
  • True
  • False
How is the percentage of oxygen in an atmosphere maintained?
  • consumption of carbon dioxide by plants
  • consumption of oxygen by living beings
  • consumption of oxygen by plants
  • consumption of carbon dioxide by animals
The constituent of air with highest proportion  :
  • $$CO_{2}$$
  • $$N_{2}$$
  • $$O_{2}$$
  • $$CO$$
What process replenishes the atmosphere with oxygen?
  • Oxygen Cycle
  • Water Cycle
  • Photosynthesis
  • Both $$A$$ and $$C$$
The major component of air is oxygen.
  • True
  • False
The pie chart shows the composition of air. Identify the gases W, X, Y.

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  • Nitrogen - Rare gases - Oxygen
  • Carbon - Oxygen - Rare gases
  • Nitrogen - Oxygen - Rare gases
  • Rare gases - Hydrogen - Oxygen
Air is said to be a mixture because air at different places contains different amounts of various gases.
  • True
  • False
The most common gas in the atmosphere is
  • Nitrogen
  • Oxygen
  • Hydrogen
  • Sulphur
Which of the following gases do not form part of the atmosphere?
  • Nitrogen
  • Chlorine
  • Carbon idoxide
  • Oxygen
  • Ozone
Carbon exists in the atmosphere in the form of:
  • carbon monoxide only
  • carbon monoxide in traces and carbon dioxide
  • carbon dioxide only
  • coal
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