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