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CBSE Questions for Class 7 Physics Winds Storms And Cyclones Quiz 5 - MCQExams.com
CBSE
Class 7 Physics
Winds Storms And Cyclones
Quiz 5
Consider the following statements:
A: During storms, all windows should be tightly shut
B: During storms, the air pressure outside a house is less than air pressure inside the house
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Both A and B are correct
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A is correct and B is incorrect
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A is incorrect and B is correct
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Both A and B are incorrect
Explanation
We know that increased wind speed is, indeed, accompanied by reduced air pressure. As the wind speed is higher outside the house the air pressure would be lesser outside. In such cases, there is a risk of the roof getting blown away, if not constructed properly. That's why it's advisable not to close all the windows of a house with poorly constructed roofs, during a storm.
Which of the following statements is/are correct?
The tropical cyclones of China Sea are called typhoons.
The tropical cyclones of the West Indies are called tornadoes.
The tropical cyclones of Australia are called willy willies.
Formation of an anticyclone results in stormy weather condition.
Select the correct answer using the code given below:
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1, 2, 3 and 4
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1, 2 and 4 only
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1 and 3 only
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3 only
Explanation
A typhoon is the name of a strong tropical cyclone whose development is common in the Western North Pacific Ocean and South China Sea.
The vast majority of tornadoes occur in the Tornado Alley region of the United States although they can occur nearly anywhere in North America.
Willy Willies is a severe tropical cyclone of Australia.
Formation of an anticyclone may or may not result in stormy weather condition depending on it's origin.
Choose the correct statement from the following.
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High speed winds are accompanied by reduced air
pressure.
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High speed winds are accompanied by increased air
pressure.
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Change in pressure does not affect the wind velocity.
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Humidity can change the velocity and direction of wind.
An anemometer is an instrument
that is most similar to a :
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Accelerator
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Speedometer
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Flag
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Electric meter
Explanation
An anemometer is a device used for measuring wind speed and direction. It is also a common weather station instrument. The term is derived from the Greek word anemos, which means wind, and is used to describe any wind speed instrument used in meteorology.
Consider the following statements:
All cyclones develop an eye at the center.
The temperature inside the eye is nearly $$10^\circ C$$ lesser than that of the surroundings.
Which of the statements given above is/are correct?
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1 only
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2 only
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Both 1 and 2
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Neither 1 nor 2
Explanation
At the centre of a cyclone is an area of calm called the eye. The eye is usually about $$40\ km$$ in diameter. Air in the centre of a cyclone is less dense than the air around it because the temperature inside the eye is greater than that of the surroundings.
At what time during a 24-hour day would a radiation temperature inversion best be developed?
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At sunset
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Near sunrise
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Toward the end of the morning
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Between 2 and 5 pm when the air temperature reaches a maximum
What is likely to happen if high speed winds blew over a building with a weak roof?
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Roof will collapse
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Roof will be blown away
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Roof will be unaffected
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Either A or B
Explanation
High speed winds right outside the building will create a low pressure region around it. As we know that air flows from higher pressure to lower pressure, it is likely that the roof will be blown away.
State true or false.
It is safe to use telephone during a thunderstorm.
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True
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False
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Ambigious
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Data insufficient
Low atmospheric pressure exists on the Earth in which of the following latitudes?
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At the equator only
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At $$30^{\circ}$$ North pole and South pole
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At the pole
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At the equator and at $$60^{\circ}$$ North pole and South pole
Explanation
The low atmospheric pressure exists at the to N and S region of the equator of the earth. This region is called the subpolar region.
A house or building is the safest place during a
thunderstorm.
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True
0%
False
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Ambigious
0%
Data insufficient
Explanation
During thunderstorm , lightning always strikes in an open area .That's why staying inside the house is considered safe during thunderstorm.
The shape of a balloon is maintained by:
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air pressure
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Temperature
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Wind velocity
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Density of air.
Explanation
When a balloon is inflated, the air inside exerts pressure on the inner surface of the balloon. But at the same time, the atmosphere exerts pressure on the outer walls of the balloon uniformly from outside. This gives the balloon its shape.
There is an eastward wind. In which direction would it be easier to fly a kite?
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East
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West
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North
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South
Explanation
Air is capable of exerting pressure. Hence it would be possible to fly a kite towards east, as air pressure will push the kite towards east.
Identify the region with the highest air pressure.
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A
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B
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C
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Both B and C
Explanation
We know that increased wind speed is accompanied by reduced air pressure. Hence, the region inside the house, where there is no wind will be at a higher pressure.
Which balloon has higher air pressure inside?
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Deflated balloon
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Inflated balloon
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Both have same air pressure
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Both have no air pressure
Explanation
Air exerts pressure. When a balloon is inflated its surface feels tighter due to the air pressure on the walls. The balloon gets its shape from the air pressure inside. Hence, the inflated balloon will have greater air pressure.
Paheli kept an empty bottle made of plastic inside a refrigerator. What is likely to happen?
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The bottles will collapse because air outside the bottle will exert extra pressure
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The bottles will expand because air outside the bottle will exert extra pressure
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The bottles will collapse because air inside the bottle will exert extra pressure
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The bottles will expand because air inside the bottle will exert pressure
Explanation
The bottles will collapse because the air outside the bottle will exert extra pressure.
When kept inside the refrigerator, the water vapors inside the bottle will condense, leaving a lot of empty space inside the bottle. The air outside the bottle will exert extra pressure which would lead to the bottle collapsing.
A tin can containing hot liquid is sealed tightly shut with a lid. If cold water is poured over it, what is likely to happen?
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Tin can will explode
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Tin can will shrink and collapse
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Tin can will remain unaffected
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Either A or B
Explanation
As water is poured over the can, some steam in the can condense into water, reducing the amount of air inside. The pressure of the air inside the can decreases than the pressure exerted by the air from outside the can. As a result, the can gets compressed.
Hence option B is correct
Pick the correct statement:
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It is easier to row a boat in the direction of wind
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It is easier to row a boat against the direction of wind
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It is easy to row a boat regardless of wind direction
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It is easier to row a boat perpendicular to the direction of wind
Explanation
As air exerts pressure, it is easier to row a boat along the direction of wind.
What can happen if you overfill a bicycle tube?
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Tube can collapse due to high air pressure outside the tube
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Tube can burst due to high air pressure outside the tube
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Tube can collapse due to high air pressure inside the tube
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Tube can burst due to high air pressure inside the tube
Explanation
In an overfilled bicycle tube, higher pressure inside the tube can lead to the tube bursting.
Wind speed in a region depends on which of the following factors?
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Humidity
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Air pressure
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Latitude/Longitude
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Pollution
Explanation
At the Earth's surface, the wind blows horizontally from high pressure to low-pressure areas. The speed is determined by the rate of air pressure change, or gradient, between the two pressure areas. The greater the pressure difference, the faster the winds.
Consider the following two statements:
A: Air moves from the region where the air pressure is high to the region where the pressure is low.
B: The greater the difference in pressure, the slower the air moves.
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Both A and B are correct
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A is correct and B is incorrect
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A is incorrect and B is correct
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Both A and B are incorrect
Explanation
Air move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.
A magician fills up one-third of a glass with water. He places a card over the mouth of the glass and inverts it. The water doesn't fall. Pick the correct explanation for this phenomenon
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air pressure outside the glass is more than the weight of the water in the glass.
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air pressure outside the glass is less than the weight of the water in the glass.
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air pressure inside the glass is more than the weight of the water in the glass.
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air pressure outside the glass is less than the weight of the water in the glass.
Explanation
The water doesn't fall because the air pressure outside the glass is more than the weight of the water in the glass. The air pressure pushes the card upwards with a greater force, thus preventing the water from falling.
When a balloon is filled with air, which of the following holds true?
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air pressure inside the balloon increases
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air pressure inside the balloon decreases
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air pressure inside the balloon remains the same
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insufficient information
Explanation
When a balloon is filled with air, air presses against the walls of the balloon giving it its shape. When a balloon is filled with air, air pressure inside the balloon increases.
What is the principle behind the working of hot air balloons?
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Atmospheric pressure
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Conduction
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Monsson winds
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Hot air rises fast
Explanation
Hot air balloons work on the principle that hot air rises fast, because it is lighter compared to cold air. By heating the air inside the balloon with the burner, it becomes lighter than the cooler air on the outside. This causes the balloon to rises upwards.
Paheli's father gifted her a polka dot balloon one summer day. Her mother turns the air conditioning on. What would Paheli observe with the balloon after an hour inside the cold room?
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The dots will move closer together
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The dots will move farther apart
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The dots remain at the same distance as they were before
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They may or may not move
Explanation
Hot air expands and cold air contracts. As the air inside the balloon slowly cools it will contract and the balloon dots will move closer together.
In the experiment to demonstrate that air exerts pressure, when ice cold water is poured over a sealed tin can containing hot air, the can collapses. Pick the correct explanation for the experiment.
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The can collapses because the pressure inside the can falls below the pressure outside the can
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The can collapses because the pressure outside the can falls below the pressure inside the can
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The air pressure inside the can is same as the pressure outside the can
0%
Insufficient information
Explanation
When cold air is poured on the can, some steam in the can condenses into water, reducing the amount of air inside. The pressure of the air inside the can decrease than the pressure exerted by the air from outside the can. As a result, they can get compressed.
A magician fills up one third of a glass with water. He places a card over the mouth of the glass and inverts it. Why doesn't the water fall?
Report Question
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The air pressure outside the glass keeps the cardboard in place
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The weight of the the water is balanced by the weight of the cardboard
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It is magic
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The air pressure inside the glass is higher
Explanation
The air outside exerts an upward pressure on the index card. This air pressure is more than the weight of the water in the glass.
Boiling tubes with balloons tied to their necks are placed in different beakers containing liquids at different temperatures as shown. Which of the following represent the correct order of the temperature of the liquids?
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$$A>B>C$$
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$$B>A>C$$
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$$C>A>B$$
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$$A>C>B$$
Explanation
We know hot air expands and cold air contracts. As the balloon in the beaker, $$B$$ seems to be inflated, it should be hotter compared to the rest of the beakers. In the beaker, $$C$$ the balloon seems deflated, which means air has contracted so it should have the least temperature.
Boiling tubes with a balloons tied to their necks are immersed in three different liquid samples as shown in the image. Which sample contains hot water?
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A
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B
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C
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Cannot be determined
Explanation
In beaker B the balloon is slightly more inflated. This means the air inside the boiling tube has expanded more in comparison to the rest of the tubes. As we know air expands on heating we can say water in beaker B is hotter.
Consider the following statements.
A. Air has the capacity to do work.
B. Air exerts pressure
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Both A and B are correct
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A is correct and B is incorrect
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A is incorrect and B is correct
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Both A and B are incorrect
Explanation
Work is given by
$$Work=Force\times Displacement$$
We know that a
ir exerts pressure and hence force.
As air can exert force and can displace and distort objects, we can say it has the capacity to do work.
Which of the following is not true for hot air in comparison to colder air?
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Hot air is lighter than cold air
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Hot air rises up
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Hot air expands
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None of the above
Explanation
Air expands on heating. As hot air expands, its density decreases and it becomes lighter and rises up in atmosphere.
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