Science - Class 7 (C ...

Q1. 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.

 

Q2. True/False

                           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. ______

 

Q3. Which one of the following place is unlikely to be affected by a cyclone?

      (i) Chennai (ii) Mangaluru (Mangalore) (iii) Amritsar (iv) Puri

 

Q4. What is wind?

 

Q5. What is anemometer?

 

Q6. When you fly a kite, does the wind coming from your back help?

 

Q7. Does the water give back heat when vapour condenses into liquid?

 

Q8. What is the main cause of wind movement?

 

Q9. Why we fill air into the bicycle tube?

 

Q10. Where do thunderstorms usually develop?

 

Q11. What do tornadoes look like?

 

Q12. From where does the word monsoon derived? What does it mean?

 

Q13. What is the direction wind in winter?

 

Q14. What are the factors that contribute to the development of cyclones?

 

Q15. What role does the wind play in the formation of storm?

 

Q16. Why do the leaves of trees, flags and banners flutter when the wind is blowing?

 

Q17. Is it difficult to ride a bicycle against the direction of the wind? Why?

 

Q18. How can cyclones be predicted?