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CBSE Questions for Class 7 Physics Winds Storms And Cyclones Quiz 2 - MCQExams.com
CBSE
Class 7 Physics
Winds Storms And Cyclones
Quiz 2
Fill in the blanks.
Air moves from a region of _______ pressure to a region of ________ pressure.
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high, low
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low, high
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high, high
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low, low
Explanation
As we know air moves from the region where the air pressure is
high to the region where the pressure
is low.
The diameter of the eye of the cyclone is about
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$$30-60km$$
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$70-90km$$
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$$100-120km$$
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$$170-200km$$
Explanation
Eye of a cyclone ranges in size from $$8 \ km \ (5 \ mi)$$ to over $$200 \ km \ (120 \ mi)$$ across, but most are approximately $$30-60 \ km$$ $$(20-40 \ mi)$$
in diameter.
The calm area, which is the center of cyclone, is called as
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Eye of Cyclone
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Heart of Cyclone
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Ear of Cyclone
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Mouth of Cyclone
Explanation
The eye is a region of mostly calm weather (
with no rain and very light winds)
at the center of strong tropical cyclones.
What is a hurricane?
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Cyclone
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Earthquake
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Tornado
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Thunderstorm
Explanation
A hurricane is a type of tropical cyclone, which is a generic term for a low-pressure system that generally forms in the tropics. The cyclone is accompanied by thunderstorms and, in the Northern Hemisphere, a counterclockwise circulation of winds near the earth's surface.
What is a cyclone ?
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A large scale air mass that rotates around a strong centre of low atmospheric pressure.
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A storm with thunder and lightning and accompanied by heavy rainfall..
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An overflow of a large amount of water beyond its normal limits
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A severe snowstorm with high winds
Explanation
Explanation:
A cyclone is a large scale air mass that rotates around a strong center of low atmospheric pressure, counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere as viewed from above. Cyclones are characterized by inward-spiraling winds that rotate about a zone of low pressure.
Which of the following precautions should be taken when you are staying in a cyclone hit area?
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Do not drink water that could be contaminated. Always store drinking water for emergencies.
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Do not touch wet switches and fallen power lines.
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Do not pressurize the rescue force by making undue demands.
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Do not go out just for the sake of fun.
Explanation
All the options are correct.
As all the four are the precautions which should be taken when you are staying in a cyclone hit area.
The centre of the cyclone is also called:
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Nose of the cyclone
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Heart of the cyclone
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Head of the cyclone
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Eye of the cyclone
Explanation
The eye is a region of mostly calm weather at the centre of strong tropical cyclones.
Which of the following Indian department provides cyclone warning services?
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Indian Forest Department
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Indian Administrative Department
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Indian Meteorological Department
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Indian Agricultural Department
Explanation
In India, warnings regarding cyclones are
issued by the meteorological
department through TV, radio, or
newspapers.
Choose the correct options (one or more)
At the poles, the air is _____ than that at latitudes about 60 degrees.
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warmer
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colder
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lighter
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Heavier
Explanation
At the
poles, the air is colder than that at
latitudes about 60 degrees and cold air is heavier than warm air.
Which of the following is most likely to be a characteristic of the 'eye' of a cyclone?
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It is an area of high pressure
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It is an area of a low pressure
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It has lots of clouds and rains
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It has high speed winds
Explanation
The correct answer is option(B).
Eye of a cyclone is a region of mostly calm weather at the center of strong tropical cyclone. It is a roughly circular area. Here the winds are light with minimum barometric pressure, i.e., area of low pressure. Hence, Eye of cyclone is in an area of low pressure.
W
hat is a typhoon essentially called as?
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A flood
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A cyclone
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An earthquake
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A tornado
Explanation
A typhoon is basically same thing as a hurricane. Both are tropical cyclone - rapidly rotating storms. If storm form in Northwest Pacific, they are called "Typhoons". Hence, a typhoon is essentially a cyclone.
Which of the following plays an important role in the early-warning systems for cyclones?
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Helicopters
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Submarines
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Satellites
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Missiles
Explanation
A satellite is an artificial object which has been intentionally placed into an orbit. As satellites are able to take photographs and observes large areas of land all over the globe, hence they play an important role in early warning systems for cyclones.
When a vehicle moves very fast a/an______it created temporarily behind it.
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Low pressure
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High pressure
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Cyclone
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None
Explanation
When wind flows very fast, low pressure is produced temporarily which is filled by the rushing wind nearby.
While drinking a soft drink with the help of a straw the pressure in the straw is _____ and the pressure in
the bottle is ________.
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High, less
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High, high
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Less, less
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Less, high
Explanation
While drinking a soft drink with the help of straw the pressure in the straw is less and the pressure in
the bottle is higher. When the air from inside the straw is sucked out, it creates a region of lower pressure inside the straw. As the pressure inside the bottle is more, the liquid is pushed upwards in the straw.
Air pressure is also known as atmospheric pressure. How is it caused?
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By the heat energy in the air
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By the wind that blows in the air
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By water vapour in the air
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By the air around us that presses on the surfaces of objects
Explanation
The pressure exerted by air around us is
known as atmospheric pressure.
If we
imagine a unit area and a very long
cylinder standing on it filled with air,
then the weight of the air in this cylinder
is the atmospheric pressure.
High speed winds are accompanied by :
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Increased pressure
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Reduced pressure
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Water vapour
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Static electricity
Explanation
The correct answer is option(B).
Winds move from a place of higher pressure to a place of lower pressure resulting in increase in the speed of winds. Accordingly, during storm the pressure becomes low due to which high speed winds prevail. also wind speed increases due to pressure gradient.
Hence, high speed winds are accompanied by reduced pressure.
Green revolution in India occurred during -
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$$1970's$$
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$$1980's$$
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$$1950's$$
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$$1960's$$
The winds on the earth do not blow exactly from "north to south" or from "south to north" directions because:
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Of the seasons of the earth
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Of the shape of the earth
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Of the rotation of the earth
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All of these
Explanation
The rotation of the earth from west to east(pulls) changes the north-south winds to northeast-southwest direction and the south-north winds to southeast-northwest direction.
A thunderstorm is accompanied by :
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Lightning
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Cyclone
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Hurricane
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Earthquake
Explanation
A thunderstorm, also known as an electrical storm or a lightning storm, is a storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere, known as thunder.
A strip of paper is held between thumb and finger. If we blow over the paper, what will happen to the paper strip ?
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The paper strip will be lifted up
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The paper strip will bend down
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The paper strip will oscillate up and down alternately
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None of the above
Explanation
The still air below the paper had greater pressure than the moving air above the paper resulting in paper getting pushed up.
Which of the following is an example of mode of transport making use of air pressure ?
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Sailing boat in an ocean
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Rowing boat on a windy day
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Aeroplane in a sky
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All the above
Explanation
A moving boat's sail is shaped as an airfoil like the wing of a plane. When air moves over a plane's wing, from front to back, wind flowing over the top of the wing has to travel farther than wind flowing under the wing's bottom surface. This creates a pressure difference that lifts the plane.
Hence all the above is the answer.
To keep people safe and secure during a cyclone, the government takes certain measures, such as
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Constructing cyclone centres in the cyclone prone areas
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Making arrangements to relocate people during cyclones
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Providing information about a cyclone, and warning people, fishermen, ships, ports, airlines and various government agencies
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All of the above
Explanation
Safety Measures Taken by the Government t
o keep people safe and secure during a cyclone, the government takes certain measures, such as:
Constructing cyclone warning centers
Making arrangements to relocate people during cyclones
Providing information about a cyclone, and warning people, fishermen, ships, ports, airlines and various government agencies
Delivering accurate and effective cyclone forecasts and warnings.
Which of the following are caused by wind ?
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The rotation of windmills
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Swinging of flowers
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Fluttering of the flags
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All of the above
Explanation
The windmills rotate only when there is wind. Flowers swing in presence of wind. Flags also swing in presence of wind. Hence, all of the above are caused by wind.
At the poles, the air is colder than that at latitudes about?
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30 degrees
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60 degrees
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90 degrees
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80 degrees
Explanation
As air current move towards the poles from the equator, their temperature goes on decreasing. This is because of increase in altitudes. This decrease can be as less as 60 degrees at the poles than at the equator.
One of the main reasons for this phenomenon is that the sun lies over head at the equator and it's rays are directly incident over i t. While at the poles, it is present at a slant ans it's rays are incident at an angle.
So, option B is the correct answer.
Why do two balloons come closer when we blow in the space between them ?
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Greater pressure inside the balloons than the reduced pressure in between them drives the balloons towards one another.
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Blowing air in between increases the pressure in between the balloons pulls them closer.
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The gravitational force pulls the two balloons closer.
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None of the above.
Explanation
When we blow between two balloons, they come closer because the pressure between the balloon decreases. The pressure inside the balloon would then push them towards each other.
Which of the following constitutes a wind energy
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Sea breeze
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Land Breeze
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Both A and B
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none of these
Explanation
The wind energy comes from the blow of wind. See breeze and land breeze together constitute the wind energy.
An experiment is conducted to understand air pressure. Two identical balloons are filled with little water and blown. Then they have tied to a string some distance apart. What happens when air is blown in between them?
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They move closer to each other.
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They move further apart.
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One moves up and other moves down
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none of the above
Explanation
When air is blown between the balloons, it creates a region of low pressure between the balloons. Since, the pressure at the outer parts is higher than inside, the balloons are pushed closer.
How does blowing inside the bottle make the paper ball come out ?
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Air pressure near the mouth of the bottle rises and reduced air pressure inside the bottle pushes the paper ball out.
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Air pressure drops inside the bottle and the air is pressed inside and the paper ball is pushed out.
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Air pressure near the mouth of the bottle drops and greater air pressure inside the bottle pushes the paper ball out.
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None of these.
Explanation
Bernoulli noticed that air has a lower pressure when it's moving more quickly. As you blow into the mouth of the bottle the air is moving fastest - so is at the lowest pressure. Inside the bottle, the air is moving more slowly - so higher pressure. As the pressure is higher inside the bottle than in the mouth this pushes the paper out.
What role can Advanced Technology play during times of disasters like Cyclones ?
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With the help of satellites and radars, cyclone warning can be issued in advance.
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Safety and urgent messages can be broadcast to disaster affected people.
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National and International organisations can come together to help the effected people.
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Both A and B
Explanation
Advanced Technology like satellites and radars, helps to issue cyclone warning in advance as they are continuously monitoring Earth from above
and urgent messages can be broadcast to
disaster-affected
people via television and radio, these are the roles that advanced technology plays.
Which of the following are not effective safety measures to be taken during a cyclone ?
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Cyclone forecast and service
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Rapid communication of the warnings
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Rush out of homes in a state of panic
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Construction of cyclone shelters in cyclone prone areas
Explanation
During cyclones it is advised to:
Stay inside and shelter {well clear of windows) in the strongest part of the building,
i.e. cellar, internal hallway or bathroom.
Hence r
ush out of homes in a state of panic
is not the effective safety measures.
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