CBSE Questions for Class 6 Chemistry Air Around Us Quiz 2 - MCQExams.com

Air has________ composition with________ oxygen at high attitudes.
  • fixed, less
  • variable, less
  • variable, more
  • fixed, more
It is not proper to breathe through our mouth because:
  • the dust particles would enter our bodies
  • more carbon dioxide will be inhaled
  • our throat will become sore
  • we will catch cold easily
John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make?
  • Air is a gas
  • Air has mass
  • Air is matter
  • Air occupies space
Which one of the following gas does not form a part of the atmosphere?
  • Nitrogen
  • Chlorine
  • Carbon dioxide
  • Oxygen
__________ is the most abundant gas in the atmosphere.
  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • None of the above
Choose the option which justifies the given statement:-
Air is considered a mixture, not a compound.
  • It is possible to separate air into its constituent gases by physical methods like fractional distillation.
  • Air does not have a fixed formula like compounds.
  •  Air shows properties same as the constituent gases present in it. 
  • All of the above

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
What is the composition of air ?
  • 70% oxygen, 29 % nitrogen and 1% other
  • 78% nitrogen, 21% oxygen and 1% other gases
  • 77% nitrogen, 21% oxygen and 2% other gases
  • None of the above
Glass panes usually appear hazy because:
  • water vapour settling on the tiny dust particles.
  • it is the property of transparent substances.
  • they are old.
  • None of these
Air is regarded as a mixture because:
  • its pressure may vary
  • its temperature may change
  • its volume changes under different conditions
  • its composition may vary
The presence of which component varies from place to place ?
  • Oxygen
  • Nitrogen
  • Water vapour
  • Carbon dioxide
Which is the most abundant gas in our atmosphere ?
  • Nitrogen
  • Oxygen
  • Carbon dioxide
  • Carbon monoxide
Which of the following gases burns in air?
  • Nitrogen
  • Carbon dioxide
  • Carbon monoxide
  • Helium
The percentage of nitrogen and oxygen in air is:
  • 21% by volume
  • 50% by weight
  • 37% by weight
  • 99% by volume
  • 29% by volume
What is the major constituent of air?
  • Hydrogen
  • Oxygen
  • Nitrogen
  • Water vapour
A greenhouse gas that absorbs energy and maintains earth's temperature is:
  • carbon dioxide
  • oxygen
  • nitrogen
  • argon
Carbon dioxide constitutes nearly ___ % of the atmosphere.
  • 45
  • 78
  • 21
  • 0.03
Combustion can not take place without:
  • water
  • carbon
  • air
  • zinc
Which of the following is not a constituent of the atmosphere?
  • Oxygen
  • Nitrogen
  • Carbon dioxide
  • Manganese dioxide
Main constituent in air is:
  • nitrogen
  • oxygen
  • argon
  • water vapor
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 6 Chemistry Quiz Questions and Answers