Tag: physics

Questions Related to physics

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

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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.