THESE NOTES ARE PREPARED ACCORDING TO JKBOSE SYLLABI IN SIMPLIFIED AND CONCISE PATTERN
Exercises
1. Fill the missing words in the blanks paces in the following statements.
a. Wind is Moving air.
b. Winds are generated due to Uneven heating on the earth.
c. Near the earth's surface Warm air rises up where as Cooler air comes down.
d. Air moves from a region of High pressure to a region of Low pressure.
2. Suggest two methods to find out wind direction at a given place.
Ans: There are many methods to find out the wind direction at a given place, e.g;
1. With the help of weathercock,
2. Use of dry sand and releasing it slowly from hand
3. Use of anemometer
3. State two experiences that made you think that air exerts pressure (other than those given in the text).
Ans: We have many experiences that suggest air exerts pressure, e.g;
1. When we go on filling air into a balloon, it bursts.
2. When meteoroid enters earths atmosphere, it burns due to air pressure.
4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Ans: No, we would should not buy a house having windows but no ventilators.
It us because, the warm foul air and vapours that will rise up cannot escape from the house.
5. Explain why holes are made in hanging banners and hoarding?
Ans: Holes are made in hanging banners and hoardings to allow the air to pass through them.
It helps to reduce the air pressure on the banners and they don't get torn apart by winds.
6. How will you help your neighbors in case a cyclone approaches your village/town?
Ans: We can help neighbors in case of a cyclone by following ways:
1. Help them move to the cyclone shelters.
2. Provide basic medical aid in case of injury.
3. Fully cooperate with them and rescue services.
4. Help arrange food, water, medicine for them.
7. What planning is required in advance to deal with the situation created by a cyclone?
Ans: Effective planning is required in advance to deal with the situation created by cyclone. It includes;
1. A cyclone forecast and warning system.
2. Construction of cyclone shelters and ready made plans to move people faster to safe places.
3. Rapid communication systems.
8. Which one of the following place is unlikely to be affected by a cyclone
i. Chennai ii. Mangaluru(Mangalore)
iii. Amritsar iv. Puri
Ans: iii. Amritsar
9. Which of the statements given below is correct ?
I. In winter the winds flow from the land to the ocean.
II. In summer the winds flow from the land towards 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.
Ans: I. In winter the winds flow from the land to the ocean
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