Question 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.
Answer: (a) moving, (b) uneven, (c) warm, cold, (d) high, low
Question 2: Suggest two methods to find out wind direction at a given place.
Answer: Two methods to find the direction of wind:
Question 3: State two experiences that made you think that air exerts pressure (other than those given in the text).
Answer: I have seen paratroopers jumping from aeroplanes. The parachute helps them in reaching the ground safely. The air pressure reduces the speed of the parachute and the paratrooper lands without getting injured.
Question 4: You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Answer: A house should have ventilators along with windows. The warm air would rise up and exit from the ventilators. The cooler air would rush in through the windows. This will help in making the rooms comfortable. A room without ventilators shall not be cooled as efficiently as one with ventilators.
Question 5: Explain why holes are made in hanging banners and hoardings.
Answer: Banners and hoardings are usually very large. The air pressure; because of the moving air; can blow away the banners. Holes are made in banners and hoardings so that the wind can move through them. This helps in reducing the impact of air pressure on the hoardings and thus they are not blown away.
Question 6: How will you help your neighbours in case cyclone approaches your village/town?
Answer: I will take following steps to help my neighbours in case of cyclone:
Question 7: What planning is required in advance to deal with the situation created by a cyclone?
Answer: Following planning is required to deal with the situation created by a cyclone:
Question 8: Which one of the following place is unlikely to be affected by a cyclone?
(i) Chennai (ii) Mangaluru (Mangalore) (iii) Amritsar (iv) Puri
Answer: (iii) Amritsar
Question 9: Which of the statements given below is correct?
Answer: (i) In winter the winds flow from the land to the ocean
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