NCERT Solutions for Class 7 Science Chapter 8

Winds, Storms and Cyclones Class 7

Exercise : Solutions of Questions on Page Number : 92

Q1 :

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.

(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 whereas __cold__ air comes down.

(d) Air moves from a region of __high__pressure to a region of __low__pressure.

Q2 :

Suggest two methods to find out wind direction at a given place.

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.

Q3 :

State two experiences that made you think that air exerts pressure (other than those given in the text).

Q4 :

You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

Q5 :

Explain why holes are made in hanging banners and hoardings.

Q6 :

Q7 :

What planning is required in advance to deal with the situation created by a cyclone?

Q8 :

Which of the following places is unlikely to be affected by a cyclone?

(i) Chennai (ii) Mangaluru (Mangalore)

(iii) Amritsar (iv) Puri

Q9 :

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.