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CBSE Questions for Class 7 Physics Winds Storms And Cyclones Quiz 3 - MCQExams.com
CBSE
Class 7 Physics
Winds Storms And Cyclones
Quiz 3
Which of the following is/are correct?
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Warm air rises
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Cold air rises
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Cold air sink
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Both A and B
Explanation
Warmer air becomes lighter and so it rises whereas cold air sinks.
An experiment is conducted. An empty flask is taken and clamped in an upside-down position over a beaker of water in such a way that the glass tube dips inside the beaker. The flask is heated at the top. Bubbles of air are observed in the water.
What accounts for the bubbles in the water ?
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The air in the flask contracts and spreads out of the flask through the tube into the beaker containing water.
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The air in the flask expands and moves out of the flask through the tube into the beaker containing water.
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The air in the flask remains as it is and the water rises through the tube into the flask.
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None of these
Explanation
As on heating the air expands and occupies
more space. And moves out of the flask through the tube into the beaker. Hence we observe bubbles of air in the water.
Which of the following is/are NOT true?
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Temperature also makes changes in air pressure
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In cold air, the molecules are more closely packed together than in warm air, so cold air is more dense than warm air
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Air pressure depends on the density of the air, or how close together its molecules are
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None of the above
Explanation
Air pressure is dependent on the temperature of air. More is the temperature, more is the air pressure and vice-versa. In cold air, the temperature is low and so the molecules of air have less kinetic energy. Due to this, the molecules are more closely packed together than in warmer air and so cold air is more dense than warm air. This also suggests that lesser is the temperature of air, more is the density of air and less is the air pressure. Hence, air pressure also depends on the density of the air.
So, all the statements are true.
Which one of the following places is unlikely to be affected by cyclone?
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Chennai
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Mangalore
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Amritsar
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Puri
Explanation
" Cyclones need large bodies of moderately warm water for their formation. They gain energy through the evaporation of water from such water bodies as the warm air above the water surface rises up.
Among the mentioned places, only Amritsar is located far away from the coastal area, all the other places namely Chennai, Mangaluru and Puri are located near the sea. So Amritsar is unlikely to be affected by a cyclone.
Which one of the following place is unlikely to be affected by a cyclone?
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Chennai
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Mangaluru (Mangalore)
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Amritsar
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Puri
Explanation
Cyclone is an intense circular storm formed due to the formation of low atmospheric pressure center, strong winds etc. and results in heavy rain.
Coastal areas are most prone to Cyclones.
Among the given options, Amritsar doesn't have a coast. So, it unlikely to be affected by a cyclone.
A storm with thunder and lightning and typically accompanied by heavy rain or hail.
Identify the phenomenon.
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Tsunami
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Thunderstorm
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Earthquake
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Flood
The height of a large cyclone is about:
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$$2-3\ km$$
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$$10-15\ km$$
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$$50-60\ km$$
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$$100-200\ km$$
Explanation
High-speed winds and air pressure differences can cause cyclones. A large
cyclone is a violently rotating mass of
air in the atmosphere, 10 to 15 km
high. The diameter of the eye varies
from $$10$$ to $$30\ km$$.
Which of the following statement is correct regarding the eye of the cyclone?
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It is an area of high pressure
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It is an area of low pressure
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It has high-speed winds
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It has lots of clouds
Explanation
The eye is an area of calm weather in the center of strong tropical cyclones. The cyclone's lowest barometric pressure occurs in the eye.
Which of the following is not true about the Eye of Cyclone ?
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It is the center area of the cyclone which is calmer
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The diameter of the eye varies from 10 to 30 km
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It is a region full of clouds and has heavy winds
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It is a region free of clouds and has light winds
Explanation
The centre of a cyclone is a calm area.
It is called the eye of the storm.
The
diameter of the eye varies
from 10 to 30 km. It is a
region free of clouds and has light
winds.
Which of the following are not associated with cyclones?
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Heavy rains
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Tidal waves
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Strong winds
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Volcanic eruptions
Explanation
Volcanic eruptions are not associated with cyclones as the other three are features of a cyclone.
Which of the following is a natural disaster?
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Storm
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Cyclone
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Flood
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All of the above
Explanation
A natural disaster is a major adverse event resulting from natural processes of the Earth; examples include floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, and other geologic processes.
Thunderstorms usually develop in which areas in India ?
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Commercial, residential and industrial areas
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Hot, humid and tropical areas
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Forest, pastures and grazing lands
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Coastal areas
Explanation
Tropical revolving storms form over warm tropical waters towards the hot and humid season and Thunderstorms are formed by the uplifting of warm and humid air.
Which of the following is not a precaution to be taken in times of a storm ?
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Seek shelter in a car or a bus
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Seek shelter under an umbrella with a metallic end
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In case of being caught in water, getting inside a building
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In case of being in a forest, seeking shelter under a tree.
Explanation
In case of storm to stay safe you should seek shelter in a closed structure like a car or bus.You can go inside building in case there is lot of water outside.You can also go below a tree in case you are in a forest.
But seeking shelter under an umbrella with a metallic end is not recommended as Lightning can travel through any metal because lightning is electricity and electricity tends to flow through metallic materials.So it is not safe to seek shelter under an umbrella.
Why are thunderstorms observed in hot areas ?
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The high temperature leads to more evaporation, more cloud formation and heavy rainfall.
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The hot areas have warm air currents in lower part of atmosphere, which lead to heavy rainfall in the area.
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The high temperature produces upward rising winds, that carry water droplets with them and results in heavy rainfall accompanied by a lightning.
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None of these
Explanation
Thunderstorms happen when there is strong warming at the Earth’s surface, creating an unstable atmosphere. That hot surface air rises, cooling as it does so, creating clouds and fueling heavy rain.
Which of the followings (one or more) play an important role in the early warning system for cyclones?
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Submarines
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Aeroplanes
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Satellite
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Radar
Explanation
Satellites and radars
play an important role in the early warning system for cyclones.
A cyclone alert or Cyclone watch is issued 48 hours in advance of any expected storm and a Cyclone warning is issued 24 hrs in advance. The message is broadcast every hour or half the hour when a cyclone is nearer the coast
How are monsoon winds formed?
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The air over the land gets heated and rises. This causes the winds to flow from the oceans towards the land, which gives rise to Monsoon winds.
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The pressure difference in adjoining areas gives rise to air movement which leads to formation of Monsoon winds
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Air that is warmed up near the Equator, moves towards each pole causing the Monsoon winds to blow.
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None of the above
Explanation
The
air over the land gets heated and rises.
This causes the winds to flow from the
oceans towards the land. These are
monsoon wind.
What is the importance of Monsoon winds ?
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They lower the temperature of areas where temperature is usually high.
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They bring rain and play important role in water cycle.
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They clear up the sky and make atmosphere sunny.
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None of the above
Explanation
The correct answer is option(B).
The winds from the oceans carry
water and bring rain. It is a part of the
water cycle.
The monsoon winds carry water
and it rain.
In which region of the cyclone, do you find high speed winds?
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In the Eye of the Cyclone
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In the region around the eye
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In the region away from the cloud
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Anywhere in the surrounding
Explanation
The center of a cyclone is a calm area. It is called the eye of the storm. A large cyclone is a violently rotating mass of air in the atmosphere, $$10$$ to $$15\ km$$ high. The diameter of the eye varies from $$10$$ to $$30\ km$$. It is a region free of clouds and has light winds. Around this calm and clear eye, there is a cloud region of about $$150\ km$$ in size. In this region, there are high-speed winds $$(150–250\ km/h)$$ and thick clouds with heavy rain. Away from this region the wind speed gradually decreases.
What is the direction of Monsoon winds in Summer ?
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From ocean towards the land
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From land towards the ocean
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From equator towards the poles
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From poles towards the equator
Explanation
Monsoon winds blow from cold to warm regions because cold air takes up more space than warm air. So, monsoons blow from the sea toward land in the summer as land is hotter and ocean is colder.
Which of the following factors will contribute to the formation of cyclone?
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Humidity
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Wind speed
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Wind direction
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All of the above
Explanation
Factors like wind speed,
wind direction, temperature and
humidity contribute to the development
of cyclones.
What does the above figure correspond to?
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Lightening
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Cyclone
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Thunderstorm
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Flood
Explanation
As a large cyclone
is a violently rotating mass of
air in the atmosphere.
A cyclone is a general term for a weather system in which winds rotate inwardly to an area of low atmospheric pressure.
Fill in the blank.
A Cyclone alert or cyclone watch is issued_____hours in advance of any expected storm and a Cyclone warning is issued ______hrs in advance.
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12, 24
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24, 12
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24, 48
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48, 24
Explanation
A
Cyclone alert or Cyclone watch is
issued 48 hours in advance of any
expected storm and a Cyclone warning
is issued 24 hrs in advance.
Which of the following depicts a cyclone ?
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0%
0%
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Explanation
Option(A) depicts forest fire. Option(B) depicts earthquake. Option(C) depicts cyclone. Option(D) depicts thunderstorm.
And a large
cyclone is a violently rotating mass of
air in the atmosphere.So option C is correct.
What is the direction of Monsoon winds in winter ?
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From oceans to land
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From land to oceans
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From equator to poles
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From poles to equator
Explanation
Image result for what is the direction of Monsoon winds in winter.
Monsoon winds blow from cold to warm regions because cold air takes up more space than warm air. So, monsoons blow from the land toward the sea in winter and from the sea toward land in the summer. India's winters are hot and dry. The monsoon winds blow from the northeast and carry little moisture.
Why do the polar winds not move in exact North-South direction?
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The revolution of the earth affects the direction of the winds.
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The rotation of the earth affects the direction of the winds.
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The Other air currents in the atmosphere change the direction of the polar winds.
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None of these
Explanation
The polar winds do not move in exact North-South direction winds would
have flown in the
north-south direction from north to
south, or from south to north. A change
in direction is, however, caused by the
rotation of the earth.
Why is warm air lighter than cold air?
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Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.
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Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.
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Due to heating, air expands. When same mass occupies more volume it becomes lighter.
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Due to heating, air contracts. When same mass occupies less volume it becomes lighter.
Explanation
Warm air is lighter than cold air because on heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter and is lesser. The warm air rises up since it is lighter. The less denser air floats in the much denser air just like ice floats on water as ice is is less dense than water.
A piece of paper is kept on the table. You have to lift it from the table by blowing high-speed air over it. In which direction will you blow the air?
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Sideways
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In the upward direction
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In the downward direction
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In the upward direction below the table
Explanation
In order to lift the paper up from the table we need to blow air in sideways (parallel to the surface of table).
Increase in air speed is associated with ______________ .
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Increase in air pressure
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Decrease in air pressure
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Increase in air temperature
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Decrease in air temperature
Explanation
As the pressure of an area reduces, wind speed increases and vice versa. Higher the pressure difference, higher the speed of wind. Thus, the two major concepts are: High speed winds are accompanied by reduced air pressure.
Which area on the Earth receives maximum sunlight ?
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Polar region
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Equatorial region
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Along the latitude of Tropic of Cancer
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Along the latitude of Tropic of Capricorn
Explanation
The Earth's shape is spherical. This causes the Sun's rays to strike the Earth's surface at different angles, creating variances in temperatures on Earth. The equator receives the most direct sunlight because sunlight arrives at a perpendicular (90 degrees) angle to the Earth.
Two pieces of papers are held parallel. Air is blown with a high speed in between them. Which of the following phenomena will be observed?
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The papers will move away from each other.
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The papers will move towards each other.
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The papers will stay at their position.
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The papers will catch fire due to increase in air temperature.
Explanation
When air is blown between two pieces of paper, the pressure between the papers is reduced. Since, the pressure at the outer parts is higher than inside, the papers will move towards each other.
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