NCERT EXERCISE QUESTIONS
1. Fill the missing word in the blank spaces in the following statements:
(a) Wind is——————air.
(b) Winds are generated due to——————heating on the earth.
(c) Near the earth’s surface __________air rises up whereas ___________ air comes down.
(d) Air moves from a region of ——— pressure to a region of——— pressure.
Ans.- (a) moving (b) uneven (c) warm; cold (d) high; low
2. Suggest two methods to find out wind direction at a given place.
Ans.- (a) By noticing the direction of dry leaves after they are released in the air. (b) By noticing the direction in which it is difficult to ride the bicycle.
3. State two experiences that made you think that air exerts pressure (other than those given in the text).
Ans.- (a) When we fill the air in the tyre, it becomes tight and if we try to fill more air it will get burst which proves air exerts pressure. (b) Blowing wind causes curtains, doors and windows to move with the direction of the wind. This demonstrates air exerts pressure.
4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Ans.- It is not at all a good idea to buy a house without ventilators because warm air is lighter than cold air hence warm air passes out of houses through ventilators. Hence, without ventilators, warm air will not pass out, and the house will remain warm.
5. Explain why holes are made in hanging banners and hoardings.
Ans.- Holes in the banners and hoardings helps air to pass through it, thereby it allows the banner to withstand the pressure of the air and remains intact.
6. How will you help your neighbors in case cyclone approaches your village/town?
Ans.- (a) By calling emergency services such as fire station, police and medical centres. (b) By helping them to shift their animals, necessary households and vehicles to a safer place. (c) By helping them shift to a safer place.
7. What planning is required in advance to deal with the situation created by a cyclone?
Ans.- (a) We should not ignore the warnings issued by the meteorological department through TV, radio, or newspapers. (b) We should make necessary arrangements to shift the essential household goods, domestic animals and vehicles, etc. to safer places. (c) Avoid driving on roads through standing water, as floods may have damaged the roads. (d) Phone numbers of all emergency services like police, fire brigade, and medical centers should be handy. (e) Always store drinking water for emergencies. (f) Do not touch wet switches and fallen power lines. (g) Do not pressurize the rescue force by making undue demands. (h) Cooperate and help your neighbor and friends.
8. Which one of the following places 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.
Junior Science Topic - Winds, Storms And Cyclone. Chapter notes, video lectures, power point presentation and NCERT exercise solution. (Class 7, CBSE syllabus, chapter 08)
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