Class 7 Science Chapter 8 Winds Storms and Cyclones.  

NCERT Solutions for Class 7 Science Chapter 8 Winds Storms and Cyclones.

Class 7 Science Chapter 8 Winds Storms and Cyclones for cbse/icse

QUE: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 __warm__ air rises up whereas _______ air comes down.
(d) Air moves from a region of __________pressure to a region of ________ pressure.

Ans:

  1. Moving
  2. Uneven
  3. Warm , Cold
  4. High , Low

 

QUE:2 Suggest two methods to find out wind direction at a given place.
Ans: The following are the two methods to find out the direction of wind.

An anemometer is an instrument used to measure wind direction and speed.

Take some paper pieces. The direction in which the paper is blowing represents the direction in which the wind is flowing

QUE:3 :State two experiences that made you think that air exerts pressure (other than those given in the text).
Ans:  The following are two experiences that led you to believe that air exerts pressure: It was difficult to fly a kite in the opposite direction of the wind. This demonstrates that air exerts pressure. It was difficult to ride a cycle in the opposite direction of the wind.

QUE:4: You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Ans:
Buying a house without a ventilator is not a good idea. Warm air rises because it is lighter than cold air. Most of this warm air can be expelled outside through ventilators. The warm air cannot escape if there are no ventilators.

QUE:5 :Explain why holes are made in hanging banners and hoardings.
Ans:
As air moves, it exerts pressure. A high-speed wind can break or displace many things. Air can pass through holes in banners and hoardings, reducing pressure on these items. The reason for making holes in banners and hoardings is to prevent wind and rain from blowing them away.

QUE:6 :How will you help your neighbors in case cyclone approaches your village/town?
Ans:
Here are a few ways to help neighbors in case of cyclone.

(i) By helping to relocate to cyclone shelters or other safer places.

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