This quiz works best with JavaScript enabled. Home > Class 6 > Class 6 Science Chapter 15 Air Around Us – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 6 Science Chapter 15 Air Around Us Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. Fire needs ..... to burn A) Carbon dioxide. B) Oxygen. C) Nitrogen. D) Carbon monoxide. Show Answer Correct Answer: B) Oxygen. 4. Envelope of air that surrounds the earth is known as A) Biosphere. B) Atmosphere. C) Ecosystem. D) Environment. Show Answer Correct Answer: B) Atmosphere. 5. Air is a mixture of many A) Solids. B) Liquids. C) Gases. D) Waters. Show Answer Correct Answer: C) Gases. 6. 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. 7. Which of the following is TRUE regarding the properties of air? A) It is a good conductor of heat. B) It is a good conductor of electricity. C) It is translucent. D) Its composition varies from place to place. Show Answer Correct Answer: D) Its composition varies from place to place. 8. Which of these does a fire need to burn? A) Argon. B) Carbon dioxide. C) Nitrogen. D) Oxygen. Show Answer Correct Answer: D) Oxygen. 9. What is the percentage of argon in the air A) 0.03%. B) 0.9%. C) 1%. D) 21%. Show Answer Correct Answer: B) 0.9%. 10. When it rains heavily.earthworm come out of the soil because ..... A) They like rain. B) No food isleft in the soil for them to eat. C) Soil is wet. D) No air is left in the soil for them to breath. Show Answer Correct Answer: D) No air is left in the soil for them to breath. 11. What is the atmosphere? A) Oxygen. B) Carbon dioxide. C) Mixture of gases. D) Water vapor. Show Answer Correct Answer: C) Mixture of gases. 12. The ratio of nitorgen to oxygen in the air is approximately ..... A) 1:4. B) 4:1. C) 1:3. D) 3:1. Show Answer Correct Answer: B) 4:1. 13. What is % of Nitrogen in Air A) 45%. B) 78%. C) 15%. D) None of the above. Show Answer Correct Answer: B) 78%. 14. 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. 15. The layer of the atmosphere containing our weather is A) Thermosphere. B) Stratosphere. C) Troposphere. D) Mesosphere. Show Answer Correct Answer: C) Troposphere. 16. The water vapor present in the air is due to ..... A) Evaporation of water from water bodies. B) Condensation of air from atmosphere. C) Revenge of Jedi from Star Wars. D) Writing of answers from thinking. E) Condensation of water from water bodies. Show Answer Correct Answer: A) Evaporation of water from water bodies. 17. 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. 18. 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. 19. 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. 20. 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. 21. 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. 22. ..... 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. 23. ..... 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. 24. 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. 25. By which method you can separate STONES from GRAINS. A) Handpicking. B) Winnowing. C) Threshing. D) Filtration. Show Answer Correct Answer: A) Handpicking. ← PreviousNext →Related QuizzesClass 6 Science Chapter 15 Air Around Us Quiz 1Class 6 Science Chapter 15 Air Around Us Quiz 3Class 6 Science Chapter 15 Air Around Us Quiz 4Class 6 Science Chapter 15 Air Around Us Quiz 5Class 6 Science Chapter 15 Air Around Us Quiz 6Class 6 Science Chapter 15 Air Around Us Quiz 7Class 6 Science Chapter 15 Air Around Us Quiz 8Class 6 Science Chapter 15 Air Around Us Quiz 9Class 6 Science Chapter 15 Air Around Us Quiz 10Class 6 Science Chapter 15 Air Around Us Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books