Chapter-15 ➤ Air Around Us 1. Air becomes thinner and thinner as we go higher and higher from the surface of earth. True False 2. Air is a compound and not an element. True False 3. Air is present in atmosphere soil water of ponds, lakes and seas everywhere 4. We breath in CO2 and breath out O2. True False 5. All living organisms require air for their survival. True False 6. Air is a mixture a pure substance an element anything, that depends on the place where it is found 7. The main constituent of the air is. nitrogen oxygen carbon dioxide hydrogen 8. Wind is air around us rising hot air air in motion none of these 9. A policeman, controlling the traffic wears a mask to prevent the dust particles from entering his respiratory system through breathing. True False 10. Which is not a property of air? It occupies space. It is transparent, It is a solution. It is a compound. Loading … Question 1 of 10
