2. Suggest two methods to find out wind direction at a given place,
3. State two experiences that made you think that air exerts pressum
Jh the earth,
air rises up whereas
(b)
Wind
(c) Near the earth's surface
air comes down.
pressure to a region of
(d) Air moves from a region of
pressure,
(other than those given in the text).
4. You want to buy a house. Would you like to buy a house having windo
but no ventilators? Explain your answer.
5. Explain why holes are made in hanging banners and hoardings
5. How will you help your neighbours in case cyclone approaches
village/town?
What planning is required in advance to deal with the nituntion or
by a malone
Answers
Answer:
Question2. Suggest two methods to find out wind direction at a given place.
Solution (2):
Two methods are:
(i) Tie a lightweight strand or tassel to an object & hang it freely. As the wind blows, the strand or tassel will also move right along with it. The direction of the wind will be the direction in which the tassel points.
(ii) Take some soapy water and a straw. With the help of a straw blow some bubbles in the air, the direction in which the bubble will move also will be the direction of the wind.
Question3. State two experiences that made you think that air exerts pressure (other than those given in the text).
Solution (3):
Two experiences are:
(i) Fill a glass (one-third of its volume) with water; cover the entire mouth with a playing card. Hold the playing card in the place and turn it upside down. Now as you will remove the hand, the card will remain in the same position for some time and water will not fall. This shows that air is exerting pressure on the card.
(ii) The door often slam whenever we open the window shows that air exerts pressure.
Question4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Solution (4):
No, because ventilators are generally at a higher height than the windows. Warm air being lighter than cold air rises up. With the help of ventilators, the warm air can easily go out of the room and will maintain proper air circulation.
Question5. Explain why holes are made in hanging banners and hoardings.
Solution (5):
Wind exerts pressure and can displace banners and hoardings. But with the help of holes, air can easily pass through it. This reduces the air pressure on the banners and hoarding.
Question6. How will you help your neighbours in case cyclone approaches your village/town?
Solution (6):
As the warning will be issued, we should communicate the warning to the neighbours. We can also help them in shifting to shelter homes. If required, we can also provide medical facilities & clean water to them.
Explanation:
Hope this answer will help you.
Answer:
2: By seeing the direction of dry leaves released in the air, by seeing the direction in which it is difficult to ride the bicycle