CBSE Questions for Class 7 Physics Winds Storms And Cyclones Quiz 3 - MCQExams.com

Which of the following is/are correct?
  • Warm air rises
  • Cold air rises
  • Cold air sink
  • Both A and B
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 ?

636081_c9c0baeab05d46cb80b74892160e6b0c.png
  • The air in the flask contracts and spreads out of the flask through the tube into the beaker containing water.
  • The air in the flask expands and moves out of the flask through the tube into the beaker containing water.
  • The air in the flask remains as it is and the water rises through the tube into the flask.
  • None of these
Which of the following is/are NOT true?
  • Temperature also makes changes in air pressure
  • In cold air, the molecules are more closely packed together than in warm air, so cold air is more dense than warm air
  • Air pressure depends on the density of the air, or how close together its molecules are
  • None of the above
Which one of the following places is unlikely to be affected by cyclone?
  • Chennai
  • Mangalore
  • Amritsar
  • Puri
Which one of the following place is unlikely to be affected by a cyclone?
  • Chennai
  • Mangaluru (Mangalore)
  • Amritsar
  • Puri
A storm with thunder and lightning and typically accompanied by heavy rain or hail. Identify the phenomenon.
  • Tsunami
  • Thunderstorm
  • Earthquake
  • Flood
The height of a large cyclone is about:
  • $$2-3\ km$$
  • $$10-15\ km$$
  • $$50-60\ km$$
  • $$100-200\ km$$
Which of the following statement is correct regarding the eye of the cyclone?
  • It is an area of high pressure
  • It is an area of low pressure
  • It has high-speed winds
  • It has lots of clouds
Which of the following is not true about the Eye of Cyclone ?
  • It is the center area of the cyclone which is calmer
  • The diameter of the eye varies from 10 to 30 km
  • It is a region full of clouds and has heavy winds
  • It is a region free of clouds and has light winds
Which of the following are not associated with cyclones?
  • Heavy rains
  • Tidal waves
  • Strong winds
  • Volcanic eruptions
Which of the following is a natural disaster?
  • Storm
  • Cyclone
  • Flood
  • All of the above
Thunderstorms usually develop in which areas in India ?
  • Commercial, residential and industrial areas
  • Hot, humid and tropical areas
  • Forest, pastures and grazing lands
  • Coastal areas
Which of the following is not a precaution to be taken in times of a storm ?
  • Seek shelter in  a car or a bus
  • Seek shelter under an umbrella with a metallic end
  • In case of being caught in water, getting inside a building
  • In case of being in a forest, seeking shelter under a tree.
Why are thunderstorms observed in hot areas ?
  • The high temperature leads to more evaporation, more cloud formation and heavy rainfall.
  • The hot areas have warm air currents in lower part of atmosphere, which lead to heavy rainfall in the area.
  • The high temperature produces upward rising winds, that carry water droplets with them and results in heavy rainfall accompanied by a lightning.
  • None of these
Which of the followings (one or more) play an important role in the early warning system for cyclones?
  • Submarines
  • Aeroplanes
  • Satellite
  • Radar
How are monsoon winds formed?
  • 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.
  • The pressure difference in adjoining areas gives rise to air movement which leads to formation of Monsoon winds
  • Air that is warmed up near the Equator, moves towards each pole causing the Monsoon winds to blow.
  • None of the above
What is the importance of Monsoon winds ?
  • They lower the temperature of areas where temperature is usually high.
  • They bring rain and play important role in water cycle.
  • They clear up the sky and make atmosphere sunny.
  • None of the above
In which region of the cyclone, do you find high speed winds?
  • In the Eye of the Cyclone
  • In the region around the eye
  • In the region away from the cloud
  • Anywhere in the surrounding
What is the direction of Monsoon winds in Summer ?
  • From ocean towards the land
  • From land towards the ocean
  • From equator towards the poles
  • From poles towards the equator
Which of the following factors will contribute to the formation of cyclone?
  • Humidity
  • Wind speed
  • Wind direction
  • All of the above
What does the above figure correspond to?
637804_a7c2ef28bdd146e2871c8bd79de27c7a.JPG
  • Lightening
  • Cyclone
  • Thunderstorm
  • Flood
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.
  • 12, 24
  • 24, 12
  • 24, 48
  • 48, 24
Which of the following depicts a cyclone ?
What is the direction of Monsoon winds in winter ?
  • From oceans to land
  • From land to oceans
  • From equator to poles
  • From poles to equator
Why do the polar winds not move in exact North-South direction?
  • The revolution of the earth affects the direction of the winds.
  • The rotation of the earth affects the direction of the winds.
  • The Other air currents in the atmosphere change the direction of the polar winds.
  • None of these
Why is warm air lighter than cold air?
  • Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.
  • Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.
  • Due to heating, air expands. When same mass occupies more volume it becomes lighter.
  • Due to heating, air contracts. When same mass occupies less volume it becomes lighter.
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?
  • Sideways
  • In the upward direction
  • In the downward direction
  • In the upward direction below the table
Increase in air speed is associated with ______________ .
  • Increase in air pressure
  • Decrease in air pressure
  • Increase in air temperature
  • Decrease in air temperature
Which area on the Earth receives maximum sunlight ?
  • Polar region
  • Equatorial region
  • Along the latitude of Tropic of Cancer
  • Along the latitude of Tropic of Capricorn
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?
  • The papers will move away from each other.
  • The papers will move towards each other.
  • The papers will stay at their position.
  • The papers will catch fire due to increase in air temperature.
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