Answer the following Questions:-
1. Suggest two methods to find out wind direction at a given place,
2. State two experiences that made you think that alr exerts pressure.
3. You want to buy a house. Would you like to buy a house having windows but no ventilators?Explain your answer.
4. Explain why holes are made in hanging banners and hoarding
5. How will you help your neighbours in case cyclone approaches your
village/town?
6. What planning is required in advance to deal with the situation created by a cyclone?
Answers
Answer:
1. Suggest two methods to find out wind direction at a given place.
Solution:
Methods to finding out the wind direction at a given place are as follows
i. By seeing the direction of dry leaves released in the air.
ii By seeing the direction in which it is difficult to ride the bicycle.
2. State two experiences that made you think that air exerts pressure (other than those given in the text).
Solution:
i. When we fill the air in the balloon, it becomes tight and if we try to fill more air balloon will get burst which proves air exerts pressure.
ii. Wind causes curtains, doors and windows to move with the direction of the wind. This demonstrates air exerts pressure.
3. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.Solution:
It is not a good idea to buy a house without ventilators because warm air is lighter than cold air hence warm air passes out of your home through ventilators. Accordingly, without ventilators, warm air will not pass out, and the house will remain warm.
4.Explain why holes are made in hanging banners and hoardings.why holes are made in hanging banners and hoardings.
Solution:
Holes in the banners and hoardings helps air to pass through it. Hence banner can withstand the pressure of the air and hence remains intact.
5.How will you help your neighbours in case cyclone approaches your village/town?will you help your neighbours in case cyclone approaches your village/town?
Solution:
We can help our neighbours in case a cyclone approaches, by any of the following measures:
By helping them shift to a safer place.
By helping them to shift their animals, necessary households and vehicles to a safer place.
By calling emergency services such as fire station, police and medical centres.
6. What planning is required in advance to deal with the situation created by a cyclone?
What planning is required in advance to deal with the situation created by a cyclone?
Solution:
We should not ignore the warnings issued by the meteorological department through TV, radio, or newspapers.
We should — make necessary arrangements to shift the essential household goods, domestic animals and vehicles, etc. to safer places;
Avoid driving on roads through standing water, as floods may have damaged the roads.
Phone numbers of all emergency services like police, fire brigade, and medical centres should be handy.
Always store drinking water for emergencies.
Do not touch wet switches and fallen power lines.
Do not pressurise the rescue force by making undue demands.
Cooperate and help your neighbours and friends.
Explanation:
Hope this will help you :)
Answer:
The following are the two methods to find out the direction of wind.
(i) While flying a kite, air exerts pressure on the kite due to which the kite flies. The direction in which the kite flies is the direction of blowing of wind.
(ii) While riding a bicycle, the direction in which it is difficult to ride is opposite to the direction of the blowing wind.
Therefore, while flying a kite or riding a bicycle, the wind direction at a given place can be determined.