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
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?
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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