20 September 2014

Wind Storm and Cyclone class7th Hots Questions

Question: 1. Why are people advised not to stand near fast moving train?
Ans: When train moves with high speed it creates region of lower pressure . This low pressure  push man towards the train
Question: 2. Why are holes made in huge hoardings? Explain their usefulness.
Ans:  Holes are made in huge hoardings to reduce air pressure causing it to flutter or blown away.
Question: 3. in winter regions near, why does wind blow from land to sea?
Ans:. In winter the sea become warmer quickly than the land. So In winter monsoon blows from land to sea
Question: 4. Why are things colorful in appearance?
Ans: The colour of object is colour that is reflected. Thus different coulor makes things colourfull.
Question: 5. Fill the missing word in the blank spaces in the following statements:
(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.
Question: 6. Suggest two methods to find out wind direction at a given place.
Answer:  Two methods to find out wind direction at a given place are:
a.  An instrument called anemometer can be used to find the direction and speed of the wind.
b.  Hold a strip of paper outside. The direction in which the paper is blowing is the direction of the flow of  the wind.
Question: 7.  State two experiences that made you think that air exerts pressure.
Answer:  Two experiences that made us think that air exerts pressure are:
1.  Whiling cycling against the direction of the wind, it is difficult to ride. It shows that the air exerts pressure.
2.  While rowing a sailboat in the direction of the wind, it is always easier to row and while rowing a sailboat against the direction of the wind, it is very difficult to row. It also shows that the air exerts pressure.
Question: 8. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Answer:   No, I would not like to buy a house having windows but no ventilators. Warm air rises up and cool air comes downward. So, to make a stream of cool and fresh air to continuously flow to the house  through the windows, there must be some ventilators in the upper part of the wall.
Question: 9.  Explain why holes are made in hanging banners and hoarders.
Answer:  Holes are made in hanging banners and hoarders to allow air to pass through them as a result of which there will be less pressure of air on the banners or hoarders. Unless it is done, these may be uprooted or distorted due to the pressure of the air.
Question:10  How will you help your neighbours in case cyclone approaches your village/town?
(a) I will help my neighbours in case cyclone approaches my village/town by the following ways.
(b) I will help my neighbours in shifting their household articles, domestic animals etc to a safe place.
(c) I will provide phone numbers of all emergency services like police, fie brigade and medical centers.
(d) I will give them safety advice like avoiding driving on roads through standing water, not touching wet switches etc.
Question: 11.What planning is required in advance to deal with the situation created by a cyclone?
Answer:  A good planning in advance will minimize the damages to be caused by a cyclone. Hence, the following planning is required.
(a)  The cyclone warning issued by the meteorological department through television, radio or news papers must not be ignored and followed carefully.
(b) The household articles, domestic animals, vehicle etc should be shifted to safe places.
(c) The telephone numbers of essential services like police, fie brigade and medical centers etc should be kept ready to meet the emergency  situation.
Question: 12. Which one of the following place is unlikely to be affected by a cyclone.
a) Chennai     2.  Mangaluru     iii) Amritsar      d) Puri
Question: 13. 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 cyclone
Question: 14.What is the Beaufort scale
Answer: The Beaufort scale is an empirical measure for the intensity of the weather based mainly on wind power
The scale was created by the British naval commander Sir Francis Beaufort around 1806
Question: 14.What is tornado?
Answer: A tornado is a violently rotating column of air that is in contact with both the surface of the earth
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