Tag: physics

Questions Related to physics

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.

State True and False :
During the day, land gets heated faster than water.

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:
During day, land gets heated faster than water as the heat capacity of land is lower than the heat capacity of water. Air above the land gets warmer and rises up. The cold air above sea moves towards land to takes its place.

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.