Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. Which of the following gases do not form part of the atmosphere? Nitrogen Oxygen Chlorine Carbon idoxide None 2. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air is a gas. Air occupies space Air is matter Air has mass None 3. Which is the most abundant gas in our atmosphere ? Nitrogen Oxygen Carbon monoxide Carbon dioxide None 4. Which of the following gases burns in air Carbon dioxide Carbon monoxide Nitrogen Helium None 5. Combustion can not take place without: carbon water zinc Air None 6. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < hydrogen nitrogen < hydrogen < oxygen hydrogen < oxygen < nitrogen oxygen < carbon dioxide < nitrogen None 7. Carbon exists in the atmosphere in the form of: carbon dioxide only carbon monoxide only carbon monoxide in traces and carbon dioxide coal None 8. It is not proper to breathe through our mouth because: more carbon dioxide will be inhaled the dust particles would enter our bodies our throat will become sore we will catch cold easily None 9. Air has________ composition with________ oxygen at high attitudes. fixed, less fixed, more variable, less variable, more None 10. Glass panes usually appear hazy because: it is the property of transparent substances None water vapour settling on the tiny dust particles. they are old. None 11. What process replenishes the atmosphere with oxygen? Both A and C Oxygen Cycle Photosynthesis Water Cycle None 12. The percentage of nitrogen and oxygen in air is: 21% by volume 50% by weight 37% by weight 99% by volume None 13. Which one of the following gas does not form a part of the atmosphere? Chlorine Nitrogen Carbon dioxide Oxygen None 14. A greenhouse gas that absorbs energy and maintains earth's temperature is: carbon dioxide argon oxygen nitrogen None 15. Carbon dioxide constitutes nearly ___ % of the atmosphere. 45 28 0.03 78 None 16. 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. (ii) and (iii) (i) and (iii) (i) and (ii) (i), (ii) and (iii) None 17. Air is regarded as a mixture because: its composition may vary its volume changes under different conditions its pressure may vary its temperature may change None 18. What is the major constituent of air Nitrogen Water vapour Hydrogen Oxygen None 19. __________ is the most abundant gas in the atmosphere. Nitrogen Oxygen None of the above Carbon dioxide None 20. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. Air does not have a fixed formula like compounds. It is possible to separate air into its constituent gases by physical methods like fractional distillation. Air shows properties same as the constituent gases present in it. All of the above None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
