(i) In summer the winds flow from the land towards the ocean.
(ii) In winter the winds flow from the land to the ocean.
(iii) A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it.
(iv) The coastline of India is not vulnerable to cyclones.
(v) Increased wind speed is accompanied by a reduced air pressure.
(vi) Regions close to the equator get maximum heat from the Sun.
Q.2. Fill in the blanks.
(i) Wind is ____ air.
(ii) Winds are generated due to ____ heating on the earth.
(iii) Near the earth’s surface ____ air rises up whereas ____ air comes down.
(iv) Air moves from a region of ____ pressure to a region of ____ pressure.
(v) Air ____ on heating.
(vi) Warm air is ____ than the cold air.
Q.3. What do tornadoes look like?
Q.4. Hold a strip of paper, 20 cm long and 3 cm wide, between your thumb and forefinger. Now blow over the paper. What do you think will happen to the paper? Give reason.
Q.5. Explain why holes are made in hanging banners and hoardings.
Q.6. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Q.7. What precautions would you take, if you are staying in a cyclone hit area?
Q.8. How technologies help people to be protected from cyclone?
Q.9. When you fly a kite, does the wind coming from your back help?
Q.10. What is the main cause of wind movement?
Q.11. Where do thunderstorms usually develop?
Q.12. From where does the word monsoon derived? What does it mean?
Q.13. Explain why smoke always rises up?
Q.14. List some effective safety measures for cyclone.
Q.15. Why is it difficult to force the paper ball into the bottle?
Q.16. Take a soft plastic bottle. Fill it with hot water. Empty the bottle and immediately cap it tightly. Place the bottle under running water. Shape of the bottle gets distorted. Explain why the bottle gets distorted?
Q.17. How will you help your neighbours in case cyclone approaches your village/town?
Q.18. List some action on the part of people in case of cyclone.
Q.19. Write an experiment to show that on heating the air expands and occupies more space.
Q.20. High speed winds are accompanied by reduced air pressure. Prove the statement with help of an experiment.