Ncert- class 6- science-Chapter 11: Air Around Us 2 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 2 1. The components of air which are harmful to living beings are dust and water vapour. dust and smoke. nitrogen and carbon dioxide. smoke and water vapour. None 2. Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain none of these. air water vapour. only oxygen gas. None 3. Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations. Bubbles of air came out from the bottle.Some water entered the bottle.Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.No bubbles formed, only water entered the bottle.Which observation(s) is/are correct? (iv) only (iii) and (iv) (ii) and (iv) (i) and (ii) None 4. Finer hair inside the nose Filter the dust particle Filter the microbes Prevent the water vapour Prevent the carbon dioxide gas None 5. Which of the following statements is incorrect? We can feel air but we cannot see it. Moving air makes it possible to fly a kite. Air is present everywhere but not in soil. All living things require air to breathe. None 6. What is not true about air? It has no role in water cycle. It makes the windmill rotate. Birds can fly due to presence of air. It helps in the movements of aeroplanes None 7. Mountaineers carry oxygen cylinders with them because? oxygen keeps them warm at low temperature. there is deficiency of oxygen on mountains at high altitude. there is no oxygen on high mountains. oxygen is used for cooking. None 8. Evaporation of water in shade is: No evaporation takes place in shade None of these slower faster None 9. Carbon dioxide, argon, methane, ozone and water vapour are also present in air in: equal quantities very small quantities very large quantities None of these None 10. What is not true about air It makes the windmill rotate. Birds can fly due to presence of air. It helps in the movements of aeroplanes It has no role in water cycle. None 11. This is used as a fuel in rockets for combustion of fuels Liquid oxygen Hydrogen Carbon dioxide Nitrogen None 12. The blanket of gases that surrounds the earth is called __________. lithosphere atmosphere biospehere air None 13. Why was there no oxygen in the early atmosphere? No vegetation No fire No water No animals None 14. Which of the following is not a constituent of the atmosphere? Oxygen Nitrogen Manganese dioxide Carbon dioxide None 15. The amount of water vapour in air is termed as None of the above mist dew humidity None 16. Wind does not help in the movement of which of the following? Firki Weather cock Ceiling fan Sailing yacht None 17. Which of these applies to nitrogen? It is 78% by volume. It help in burning It helps in respiration It help in photosynthesis None 18. Which of the following statements is incorrect? We can feel air but we cannot see it. Moving air makes it possible to fly a kite Air is present everywhere but not in soil All living things require air to breathe. None 19. Clothes dry faster when there is ______ water vapour in air. more either less or more none of these less None 20. Identify the gas "Odourless, Colourless, Heavier than air, supports combustion" Water vapours Carbon Dioxide 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.
