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