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Uneven heating of earth - class-VII

Description: uneven heating of earth
Number of Questions: 32
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Tags: winds, storms and cyclones natural disasters: winds, storms and cyclones paths of heat flow physics structure of earth temperature and heat air, winds and cyclones
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Convectional currents are set up, giving rise to :

physics winds, storms and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Land breezes

  2. Land clean

  3. Sea water heated up

  4. None

Show answer
Correct Option: A
Explanation:

The warm air above the sea rises up and cool air above land blows towards the sea to take the place of warm air.

Sea breeze blows

physics winds, storms and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. During day

  2. During night

  3. Throughout day and night

  4. None of these

Show answer
Correct Option: A
Explanation:

Sea breeze, a local wind system characterized by a flow from sea to land during the day

Ocean thermal energy is due to 

physics winds, storms and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. temperature difference at different levels in the ocean

  2. tides in the ocean

  3. energy stored by the water waves

  4. pressure different at different levels in the ocean

Show answer
Correct Option: A
Explanation:

Different temperature at different levels of ocean.

The sun’s heat warms the surface water a lot more than the deep ocean water, which creates the ocean’s naturally available temperature gradient, or thermal energy.

Wind currents are generated due to:

physics winds, storms and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Uneven heating between the equator and the poles

  2. Change in atmospheric pressure

  3. Thunderstorm

  4. Cyclone

Show answer
Correct Option: A
Explanation:

The correct answer is option(A).

We know poles are cooler than equator as highest intensity of the sun's heat and light falls on the equator and it reduces as we go either side of the equator towards the poles. Cooler air from the surrounding areass of the equator comes towards the equator to fill the place of warm air which rises up due to sun's heating. Hence, wind currents are generated due to uneven heating.

During day time air blows-

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. from the land to the sea

  2. from the sea to the land

  3. from one sea to another

  4. none of these

Show answer
Correct Option: B
Explanation:
During day time air blows $\rightarrow$ from sea to land, because in day time the land is warmer than sea.
Therefore air pressure of land is lower than sea.
As a result air blows from sea to land.

During night time cool breeze blows from_to __

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. land, sea

  2. sea,land

  3. mountain,land

  4. land,mountain

Show answer
Correct Option: A
Explanation:
During night time cool breeze blows from land to sea.
As we know, water is good absorber of heat, it takes more time to heat up and cool down water than that of land. And during night, land cools down quickly than that of water causing high pressure over land and hot air above water causes low pressure over water. As we know wind blow from higher pressure to lower pressure, so during night cool breeze blows from land to sea.

State whether given statement is True or False
During the night, land cools faster than sea.

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

It is true that during night; land cools faster than sea.

As we know; water is good absorber of heat, it takes more time to heat up and cool down too. So during night; land cools faster than water.

Which of the following constitutes a wind energy 

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. Sea breeze

  2. Land Breeze

  3. Both A and B

  4. none of these

Show answer
Correct Option: C
Explanation:

See breeze and land breeze together constitute the wind energy.

Which of the following is an example of mode of transport making use of air pressure ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Sailing boat in an ocean

  2. Rowing boat on a windy day

  3. Aeroplane in a sky

  4. All the above

Show answer
Correct Option: D
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.

What affects the direction of kite in the sky ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Motion of bird in the sky

  2. Clouds in the sky

  3. Wind blowing in the sky

  4. Other kites around it

Show answer
Correct Option: C
Explanation:
A kite relies on tension from the string and moving air created by the wind or the forward motion of the kite flyer to generate thrust.

Which of the following is not an example of air exerting pressure ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Pressing the brakes of a bicycle.

  2. Filling up the bicycle tube with air

  3. Riding bicycle against the flow of wind

  4. Playing with the kite

Show answer
Correct Option: A
Explanation:
Brakes on a bicycle work using friction (the rubbing force between two things that slide past one another while they're touching). Hence brakes doesn't work on the principle of air exerting pressure.

Which of the following can be described as convection current

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. Sea Breeze and land Breeze

  2. Heat transfer from one end to another in a metal rod

  3. Sun's radiations

  4. None of these

Show answer
Correct Option: A
Explanation:

Sea breeze and land breeze are described as convection current.

Which of the following are caused by wind ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. The rotation of windmills

  2. Swinging of flowers

  3. Fluttering of the flags

  4. All of the above

Show answer
Correct Option: D
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.

Which source of energy makes use of the air pressure in generation of energy ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Hydroelectric Power plant

  2. Nuclear reactor

  3. Windmill

  4. Thermal power plant

Show answer
Correct Option: C
Explanation:
Windmill makes use of the air pressure in the generation of energy, as hydroelectric power plants capture the energy of falling water to generate electricity.
A nuclear reactor produces electricity by chain reaction produces the energy, which turns water into steam. The pressure of the steam turns a generator, which produces electricity. 
In a thermal power plant fuel is burned to produce heat, this heat is used to change water into steam. this drives the generator to produce electricity.
Whereas in windmill the energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to create electricity.

A strip of paper is held between thumb and finger. If we blow over the paper, what will happen to the paper strip ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. The paper strip will be lifted up

  2. The paper strip will bend down

  3. The paper strip will oscillate up and down alternately

  4. None of the above

Show answer
Correct Option: A
Explanation:
The still air below the paper had greater pressure than the moving air above the paper resulting in paper getting pushed up.

An experiment is conducted to understand air pressure. Two identical balloons are filled with little water and blown. Then they are tied to a string some distance apart. What happens when air is blown in between them ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. They move closer to each other.

  2. They move further apart.

  3. One moves up and other moves down

  4. none of the above

Show answer
Correct Option: A

How are monsoon winds formed?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. 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.

  2. The pressure difference in adjoining areas gives rise to air movement which leads to formation of Monsoon winds

  3. Air that is warmed up near the Equator, moves towards each pole causing the Monsoon winds to blow.

  4. None of the above

Show answer
Correct Option: A
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 direction of Monsoon winds in Summer ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. From ocean towards the land

  2. From land towards the ocean

  3. From equator towards the poles

  4. From poles towards the equator

Show answer
Correct Option: A
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 winds.

Why do the polar winds not move in exact North-South direction ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. The revolution of the earth affects the direction of the winds.

  2. The rotation of the earth affects the direction of the winds.

  3. The Other air currents in the atmosphere change the direction of the polar winds.

  4. None of these

Show answer
Correct Option: B
Explanation:
 A change in direction of wind is however, caused by the rotation of the earth.

What is the direction of Monsoon winds in winter ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. From oceans to land

  2. From land to oceans

  3. From equator to poles

  4. From poles to equator

Show answer
Correct Option: B
Explanation:
In winter, the direction of the wind flow gets reversed; it flows from the land to the ocean.

Which of the following is not true about the formation of winds due to uneven heating of land at Equator and Polar regions ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. The winds blow from the $0-30^o$ latitudes, taking place of the warm air at the equator that has risen up, towards the equator and constitute the Polar winds.

  2. The cool air at the poles rushes in to take place of the warmer winds in the $60^o$ belt and constitute the Polar winds.

  3. The winds of the wind is not exactly in the North-South direction because of the rotation of the Earth.

  4. The pressure difference between the equatorial and polar regions leads to the formation of winds in the North-South direction

Show answer
Correct Option: D
Explanation:
Formation of winds at the equator and polar region involves following few steps:
1. The warm air rises, and the cooler air from the regions in the 0–30 degrees latitude belt on either side of the equator moves in.
2.  At the poles, the air is colder than that at latitudes about 60 degrees. 
3.  The warm air at these latitudes rises up and the cold wind from the polar regions rushes in, to take its place
4.  A change in direction is, however, caused by the rotation of the earth.

What is the importance of Monsoon winds ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. They lower the temperature of areas where temperature is usually high.

  2. They bring rain and play important role in water cycle.

  3. They clear up the sky and make atmosphere sunny.

  4. None of the above

Show answer
Correct Option: B
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.

Which area on the Earth receives maximum sunlight ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. Polar region

  2. Equatorial region

  3. Along the latitude of Tropic of Cancer

  4. Along the latitude of Tropic of Capricorn

Show answer
Correct Option: B
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.

What is the basis for the formation of winds due to heating of different areas on Earth ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. The air in cold temperature regions gets cooled, expands and becomes more dense and rises up. It's place is taken by heavier air from adjacent regions.

  2. The air in cold temperature regions gets cooled up, expands and becomes less dense and rises up. It's place is taken by heavier air from adjacent regions.

  3. The air in high temperature regions gets heated up, expands and becomes less dense and rises up. It's place is taken by heavier air from adjacent regions.

  4. The air in high temperature regions gets heated up, contracts and becomes more dense and rises up. It's place is taken by heavier air from adjacent regions.

Show answer
Correct Option: C
Explanation:
In summer, near the equator the land warms up faster and most of the time the temperature of the land is higher than that of water in the oceans. The air over the land gets heated and rises. This causes the winds to flow from the oceans towards the land. And we know air expands on heating and and becomes less dense and therefore rises up.

At poles, how is the direction of Polar winds ?

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. Air from Polar region moves in towards the $60^o$ latitude belt

  2. Air from the $60^o$ latitude belt moves in towards Polar region

  3. Air from Polar region moves in towards the equatorial region

  4. Air from equatorial region moves in towards the Polar region

Show answer
Correct Option: A
Explanation:
At the poles, the air is colder than that at latitudes about 60 degrees. The warm air at these latitudes rises up and the cold wind from the polar regions rushes in, to take its place.

Arrange the following steps in the proper order to explain how a sea breeze occurs, near coastal regions.
(a) The temperature of land rises rapidly as compared to sea, because the specific heat capacity of land is five times less than that of water.
(b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land.
(c) The sun shines equally on the land mass and sea, giving equal amount of heat energy to both.
(d) The air above the land becomes hot and light, rises up and hence creates the low pressure over the land.

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. a d c b

  2. c d a b

  3. c a b d

  4. c a d b

Show answer
Correct Option: D
Explanation:

Near the coastal regions, when (c) the sun shines equally on the land mass as well as the sea giving an equal amount of heat energy.But (a) the temperature of land rises rapidly as compared to the sea water, as specific heat capacity of water is five times greater than that of land. So, water requires more heat energy to raises its temperature by $1^{\circ}C$. Then (d) the air above the land mass becomes hotter and lighter and hence rises up, which creates a low pressure over the land. (b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land, by this producing sea breeze.

Sea breeze and land breeze

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. are caused by currents set up in air due to conduction

  2. are caused by currents set up in air due to convection

  3. are caused by currents set up in air due to radiation

  4. have no relation to conduction, convection and radiation

Show answer
Correct Option: A

State whether true or false.
The land and sea breezes are based on the fact that the specific heat of vaporisation of steam is very high.

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
The statement is true.
The specific heat capacity of water is much higher than that of sand. Air above land becomes more warmer than water during day. So cold air above water or sea blows to land known as sea breeze and vice versa for land breeze.

A small weight put on the pressure cooker increased the pressure of steam because.

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  1. Density of metal is very high

  2. Area of contact is very small

  3. It is air tight

  4. Pressure builds up irrespective of the weight placed

Show answer
Correct Option: B
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