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