NCERT Solutions for Class 7th Science
Chapter 8 - WINDS, STORMS AND CYCLONES
(Complete Downloadable Chapter Solution PDF file is at the bottom of the page)
Q.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) 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.
Q.2 Suggest two methods to find out wind direction at a given place.
Ans 1) Fly a kite. The kite will fly in the direction of wind.
2) Take fine soil or sand in the hand and release it from a height. It will move in the direction of wind.
Q.3 State two experiences that made you think that air exerts pressure (other than those given in the text).
Ans 1) Movement of curtain due to air coming from the cooler.
2) Bursting of a balloon when excess air is blown into it.
Q.4 You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Q.5 Explain why holes are made in hanging banners and hoardings.
Q.6 How will you help your neighbours in case cyclone approaches your village/town?
Q.7 What planning is required in advance to deal with the situation created by a cyclone?
Q.8 Which one of the following place is unlikely to be affected by a cyclone.
(i) Chennai (ii) Mangaluru (Mangalore) (iii) Amritsar (iv) Puri
Q.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.