Air Around Us
Q.1. What is a wind?
Q.2. What is a storm?
Q.3. What is the use of a weather clock?
Q.4. Wind helps in the movement of what?
Q.5. Give two properties of air?
Q.6. What is the atmosphere?
Q.7. Why do mountaineers carry oxygen cylinders while climbing high mountains?
Q.8. What keeps the atmosphere in its place?
Q.9. Who discovered oxygen and in which year?
Q.10. Name the main gases present in the air.
Q.11. What is the fraction of Nitrogen in the air?
Q.12. Does nitrogen support combustion?
Q.13. What is the term used for the amount of water vapour present in the air?
Q.14. Which place has more humidity, Mumbai or Delhi?
Q.15. Humans give out which gas during respiration?
Q.16. Why do we feel suffocated, if some material is burning in a closed room with no ventilation?
Q.17. Which colour is given by carbon dioxide present in the air to lime water?
Q.18. Why do policemen wear masks in crowded crossings?
Q.19. Why should we breathe through the nose?
Q.20. Why do dolphins and whales come to the surface of water?
Q.21. How does oxygen become available to plants and animals living in water?
Q.22. Show with the help of an experiment that air is dissolved in water.
Q.23. How do organisms living in soil get oxygen to respire?
Q.24. What is the Oxygen cycle?
Q.25. What are the uses of air?
