Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. What process replenishes the atmosphere with oxygen? Oxygen Cycle Water Cycle Both A and C Photosynthesis None 2. Air is regarded as a mixture because: its composition may vary its volume changes under different conditions its temperature may change its pressure may vary None 3. The correct ascending order of gases as per their composition in air is: nitrogen < hydrogen < oxygen oxygen < carbon dioxide < hydrogen oxygen < carbon dioxide < nitrogen hydrogen < oxygen < nitrogen None 4. 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 has mass Air is matter None 5. Air has________ composition with________ oxygen at high attitudes. fixed, more variable, more fixed, less variable, less None 6. Carbon dioxide constitutes nearly ___ % of the atmosphere. 78 45 0.03 28 None 7. 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 None 8. __________ is the most abundant gas in the atmosphere. Carbon dioxide Oxygen None of the above Nitrogen None 9. Carbon exists in the atmosphere in the form of: carbon monoxide in traces and carbon dioxide carbon monoxide only coal carbon dioxide only None 10. Which of the following gases burns in air Carbon dioxide Helium Carbon monoxide Nitrogen None 11. Which is the most abundant gas in our atmosphere ? Carbon monoxide Nitrogen Oxygen Carbon dioxide None 12. The percentage of nitrogen and oxygen in air is: 50% by weight 21% by volume 37% by weight 99% by volume None 13. Which one of the following gas does not form a part of the atmosphere? Oxygen Nitrogen Chlorine Carbon dioxide None 14. 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), (ii) and (iii) (i) and (ii) (ii) and (iii) (i) and (iii) None 15. Glass panes usually appear hazy because: water vapour settling on the tiny dust particles. they are old. it is the property of transparent substances None None 16. Combustion can not take place without: water zinc Air carbon None 17. Which of the following gases do not form part of the atmosphere? Oxygen Nitrogen Carbon idoxide Chlorine None 18. A greenhouse gas that absorbs energy and maintains earth's temperature is: nitrogen argon oxygen carbon dioxide None 19. What is the major constituent of air Water vapour Oxygen Nitrogen Hydrogen None 20. It is not proper to breathe through our mouth because: the dust particles would enter our bodies our throat will become sore we will catch cold easily more carbon dioxide will be inhaled 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.
