Tag: air, winds and cyclones

Questions Related to air, winds and cyclones

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 True or False :
Convection currents are set up giving rise to sea breezes. 
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:

Yes, it is true; convection current are set up giving rise to sea breezes.

Convectional currents are the result of differential heating. Less dense(lighter) warm materials rise while heavier(more dense) cool materials sink. It is the movement that creates circulation pattern known as convectional current in atmosphere, water and mantle of earth.

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.