Question 1. Fill in 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.
Solution 1.
(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 air pressure to a region of low air pressure.
Question 2. Suggest two methods to find out wind direction at a given place.
Solution 2. Methods to find out the wind direction at a given place are as follows
- a) By observing the direction of dry leaves and any piece of a paper released in the air.
- b) by using a wind pane.
Question 3. State two experiences that made you think that air exerts pressure (other than those given in the text).
Solution 3. a) When we overfill air in a balloon it gets burst this proves that air exerts pressure which is why due to excessive pressure it gets burst.
- b) curtains, doors and windows move in the direction of the wind.
Question 4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Solution 4. No, we would not like to buy a house having windows but no ventilators because ventilators help to pass out warm air from the house and keep your house cool that is why only windows are not sufficient for a house. A house must have ventilation as well.
Question 5. Explain why holes are made in hanging banners and hoardings.
Solution 5. Holes help air to pass through the banner so that hoardings can bear air pressure and remains intact.
Question 6. How will you help your neighbours in case a cyclone approaches your village/town?
Solution 6. We can help our neighbours in case of a cyclone in the following ways:
- Shift them to a safer place.
- shift their animals, necessary households and vehicles to some safer place.
- By calling emergency services like the fire station, police and medical centres.
Question 7. What planning is required in advance to deal with the situation created by a cyclone?
Solution 7.
- Consider the warnings issued by the meteorological department through TV, radio, or newspapers.
- We should move the essential household goods, domestic animals and vehicles, etc. to safer places;
- Avoid driving on flood-affected roads.
- Be ready with the phone numbers of all emergency services like police, fire brigade, and medical centres.
- For emergencies always store drinking water.
- Do not touch wet electric switches and fallen power lines.
- Cooperate and help your neighbours and friends.
Question 8. Which one of the following places is unlikely to be affected by a cyclone?
(i) Chennai
(ii) Mangaluru (Mangalore)
(iii) Amritsar
(iv) Puri
Solution 8.
The answer is (iii) Amritsar is unlikely to be affected by a cyclone because Amritsar is far away from the sea and the remaining three are more likely to be hit by cyclones because they are near coastal areas.
Question 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.
Solution 9. (i) In winter, the winds flow from the land to the ocean.