This quiz works best with JavaScript enabled. Home > Cbse > Class 6 > Science > Air Around Us > Class 6 Science Chapter 15 Air Around Us – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 6 Science Chapter 15 Air Around Us Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The organ by which mammals breathe in air A) Gills. B) Skin. C) Lungs. D) None of the above. Show Answer Correct Answer: C) Lungs. 2. What is the main cause of air pollution? A) Vehicles. B) Factories. C) Burning. D) All of the above. Show Answer Correct Answer: D) All of the above. 3. Air contains ..... oxygen A) 21%. B) 50%. C) 100%. D) 25%. Show Answer Correct Answer: A) 21%. 4. Air pressure ..... as altitude ..... A) Increases, decreases. B) Stays the same, decreases. C) Stays the same, increases. D) Decreases, increases. Show Answer Correct Answer: D) Decreases, increases. 5. Apart from the different gases what does air contain? A) Fire. B) Water. C) Dust. D) Smoke. Show Answer Correct Answer: C) Dust. 6. What is the percentage of Nitrogen in air? A) 75%. B) 79%. C) 72%. D) 78%. Show Answer Correct Answer: D) 78%. 7. The major part of air which do not support burning is called A) Oxygen. B) Carbondioxide. C) Nitrogen. D) None of the above. Show Answer Correct Answer: C) Nitrogen. 8. Air is present in A) Atmosphere. B) Soil. C) Water. D) Everywhere. Show Answer Correct Answer: A) Atmosphere. 9. The layer of thin air around the earth is known as ..... A) Ozone layer. B) Atmosphere. C) Oxygen. D) Nitrogen. Show Answer Correct Answer: B) Atmosphere. 10. Air is not present in A) Building. B) Caves. C) Ocean. D) Vaccum. Show Answer Correct Answer: D) Vaccum. 11. Plants cannot utilise which component of air directly? A) Carbondioxide. B) Nitrogen. C) Oxygen. D) Water vapour. Show Answer Correct Answer: B) Nitrogen. 12. Until the eighteenth century, people thought that air was just ..... substance. A) One. B) Many. C) All the above. D) None of the above. Show Answer Correct Answer: A) One. 13. Moisture in air is called as A) Atmosphere. B) Humidity. C) Respiration. D) None of the above. Show Answer Correct Answer: B) Humidity. 14. Air is a ..... of different gases. A) Separation. B) Solution. C) Division. D) Mixture. Show Answer Correct Answer: D) Mixture. 15. The component of air used by green plants to make their food, is ..... A) Ozone layer. B) Argon. C) Hydrogen. D) Carbon dioxide. Show Answer Correct Answer: D) Carbon dioxide. 16. Name the component of the air which support burning. A) Nitrogen. B) Carbon dioxide. C) Oxygen. D) Water vapour. Show Answer Correct Answer: C) Oxygen. 17. State true or false Sound can travel only in air ..... A) True. B) Speak. C) All the above. D) None of the above. Show Answer Correct Answer: B) Speak. 18. We can live without air. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 19. The ratio of nitrogen to oxygen in the air is A) 4:1. B) 1:2. C) 1:4. D) 3:1. Show Answer Correct Answer: A) 4:1. 20. Plants and animals are interdependent of each other. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. Where is oxygen present? A) Wind. B) Water. C) Soil. D) All of the above. Show Answer Correct Answer: D) All of the above. 22. How do the animals breath in soil? A) There is air already present there. B) The animals makes hole in the soil and then let rain come and when the soil gets wet the air comes from under. C) The rain comes and then the holes are made by rain and by holes the air passes through it. D) The rain comes when the hole is made by rain and water is filled the bubbles come out and air fills. E) They blow up the air by their mouth in the hole. Show Answer Correct Answer: D) The rain comes when the hole is made by rain and water is filled the bubbles come out and air fills. 23. Arrange the jumbled words TUDS ..... A) Dust. B) Air. C) Water. D) None of the above. Show Answer Correct Answer: A) Dust. 24. Cool air is ..... so it ..... , but warm air is ..... , so it ..... A) Lighter, rises, heavier, sinks. B) Heavier, sinks, lighter, rises. C) All the above. D) None of the above. Show Answer Correct Answer: B) Heavier, sinks, lighter, rises. 25. The amount of water vapour present in the air is referred as humidity A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 26. Fire needs ..... to burn A) Nitrogen. B) Carbon monoxide. C) Oxygen. D) Carbon dioxide. Show Answer Correct Answer: C) Oxygen. 27. Envelope of air that surrounds the earth is known as A) Atmosphere. B) Biosphere. C) Ecosystem. D) Environment. Show Answer Correct Answer: A) Atmosphere. 28. Air is a mixture of many A) Liquids. B) Waters. C) Solids. D) Gases. Show Answer Correct Answer: D) Gases. 29. Birds, bats and insects can fly because of the air. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 30. Which of the following is TRUE regarding the properties of air? A) It is translucent. B) It is a good conductor of heat. C) It is a good conductor of electricity. D) Its composition varies from place to place. Show Answer Correct Answer: D) Its composition varies from place to place. 31. Which of these does a fire need to burn? A) Nitrogen. B) Carbon dioxide. C) Argon. D) Oxygen. Show Answer Correct Answer: D) Oxygen. 32. What is the percentage of argon in the air A) 21%. B) 0.9%. C) 1%. D) 0.03%. Show Answer Correct Answer: B) 0.9%. 33. When it rains heavily.earthworm come out of the soil because ..... A) No air is left in the soil for them to breath. B) They like rain. C) Soil is wet. D) No food isleft in the soil for them to eat. Show Answer Correct Answer: A) No air is left in the soil for them to breath. 34. What is the atmosphere? A) Carbon dioxide. B) Oxygen. C) Water vapor. D) Mixture of gases. Show Answer Correct Answer: D) Mixture of gases. 35. The ratio of nitorgen to oxygen in the air is approximately ..... A) 3:1. B) 4:1. C) 1:4. D) 1:3. Show Answer Correct Answer: B) 4:1. 36. What is % of Nitrogen in Air A) 45%. B) 78%. C) 15%. D) None of the above. Show Answer Correct Answer: B) 78%. 37. Plants consume oxygen for preparing food by the process of photosynthesis. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 38. The layer of the atmosphere containing our weather is A) Thermosphere. B) Troposphere. C) Stratosphere. D) Mesosphere. Show Answer Correct Answer: B) Troposphere. 39. The water vapor present in the air is due to ..... A) Condensation of air from atmosphere. B) Condensation of water from water bodies. C) Evaporation of water from water bodies. D) Revenge of Jedi from Star Wars. E) Writing of answers from thinking. Show Answer Correct Answer: C) Evaporation of water from water bodies. 40. Condenses and drops of water appear on the cooled surfaces. A) Oxygen. B) Carbondioxide. C) Water Vapour. D) None of the above. Show Answer Correct Answer: C) Water Vapour. 41. What layer protects us from the sun's harmful rays? A) Protection layer. B) Ozone layer. C) Atmospheric layer. D) None of the above. Show Answer Correct Answer: B) Ozone layer. 42. What gas are noble gases (studied in class 5th)? A) Xenon. B) Argon. C) Ozone. D) Both A and B. Show Answer Correct Answer: D) Both A and B. 43. Plants and trees give out oxygen and keep the air clean. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 44. What is air made-up of? Page86 Eswarao.M A) Nitrogen, Oxygen, and trace gases. B) Methane, Carbon monoxide, and Sulfur dioxide. C) Hydrogen, Neon, and Krypton. D) Carbon dioxide, Helium, and Argon. Show Answer Correct Answer: A) Nitrogen, Oxygen, and trace gases. 45. ..... present inside the nose helps to prevent dust particles form getting inside our respiratory system. A) Mucus. B) Fine hair. C) Both. D) Skin. Show Answer Correct Answer: C) Both. 46. ..... portion of air is nitrogen. A) 5/4. B) 3/4. C) 8/6. D) None of the above. Show Answer Correct Answer: B) 3/4. 47. Thick layer around the earth is called A) Ozone layer. B) Atmosphere. C) All the above. D) None of the above. Show Answer Correct Answer: B) Atmosphere. 48. By which method you can separate STONES from GRAINS. A) Handpicking. B) Winnowing. C) Threshing. D) Filtration. Show Answer Correct Answer: A) Handpicking. 49. Which gas to plants breathe? A) Carbon-Dioxide. B) Oxygen. C) Nitrogen. D) Hydrogen. Show Answer Correct Answer: B) Oxygen. 50. Why do plants need air? A) Plants need air to breathe. B) Plants need air to sleep. C) Plants need air to smell. D) None of the above. Show Answer Correct Answer: A) Plants need air to breathe. 51. Which of the following is NOT present in air?(a) Oxygen(b) Nitrogen(c) Helium(d) Iron A) B. B) A. C) C. D) D. Show Answer Correct Answer: D) D. 52. ..... Gas occupies the largest part of composition of a A) Nitrogen. B) Hydrogen. C) Oxygen. D) Carbon dioxide. Show Answer Correct Answer: A) Nitrogen. 53. We can ..... the air. A) Feel. B) Touch. C) All the above. D) None of the above. Show Answer Correct Answer: A) Feel. 54. The total percentage of nitrogen and oxygen in air is A) 10. B) 78. C) 99. D) 100. Show Answer Correct Answer: C) 99. 55. In a closed room, if there is some material that is burning, you may have felt suffocation. This is due to the presence of A) Oxygen. B) Water vapour. C) Nitrogen. D) Carbon dioxide. Show Answer Correct Answer: D) Carbon dioxide. 56. Which of the following gas we use in breathing? A) Carbon dioxide. B) Nitrogen. C) Oxygen. D) None of these. Show Answer Correct Answer: C) Oxygen. 57. Air is used by all the organisms for A) Digestion. B) Respiration. C) Excretion. D) None of the above. Show Answer Correct Answer: B) Respiration. 58. What occupies space? A) Water. B) Air. C) Ball. D) Both a&c. Show Answer Correct Answer: B) Air. 59. Plants give out this gas during photosynthesis A) Nitrogen. B) Oxygen. C) Carbon dioxide. D) None of the above. Show Answer Correct Answer: B) Oxygen. 60. Which of the following is NOT true about air? A) Air can be compressed (pushed into a smaller space). B) Air has mass. C) Air takes up space. D) All of the above are true. Show Answer Correct Answer: D) All of the above are true. 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