Tag: air, winds and cyclones

Questions Related to air, winds and cyclones

Why do two balloons come closer when we blow in the space between them ?

physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

  1. Greater pressure inside the balloons than the reduced pressure in between them drives the balloons towards one another.

  2. Blowing air in between increases the pressure in between the balloons pulls them closer.

  3. The gravitational force pulls the two balloons closer.

  4. None of the above.

Show answer
Correct Option: A
Explanation:
When we blow between two balloons, they come closer because the pressure between the balloon decreases. The pressure inside the balloon would then push them towards each other.

Which of the following is/are true?

physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

  1. The wind blows because of differences in air pressure from one location to another

  2. Wind blows from areas of high pressure toward areas of low pressure

  3. If the high pressure area is very close to the low pressure area, or if the pressure difference is very great, the wind can blow very fast

  4. All of the above

Show answer
Correct Option: D
Explanation:
Wind flowing is the result of pressure difference in air between the two regions. Winds flows from the region of higher pressure to the region of lower pressure. Greater is the pressure difference, greater is the speed of the wing flowing and vice-versa.
Thus all the statemements are true, so option D is correct.

Which of the following is/are correct?

physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

  1. Warm air rises

  2. Cold air rises

  3. Cold air sink

  4. Both A and B

Show answer
Correct Option: A,C
Explanation:

Warmer air becomes lighter and so it rises whereas cold air sinks.

Which of the following is/are NOT true?

physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

  1. Temperature also makes changes in air pressure

  2. In cold air, the molecules are more closely packed together than in warm air, so cold air is more dense than warm air

  3. Air pressure depends on the density of the air, or how close together its molecules are

  4. None of the above

Show answer
Correct Option: D
Explanation:
Air pressure is dependent on the temperature of air. More is the temperature, more is the air pressure and vice-versa. In cold air, the temperature is low and so the molecules of air have less kinetic energy. Due to this, the molecules are more closely packed together than in warmer air and so cold air is more dense than warm air. This also suggests that lesser is the temperature of air, more is the density of air and less is the air pressure. Hence, air pressure also depends on the density of the air.
So, all the statements are true.

____ pressure indicates sinking air where clouds cannot form. ____ pressure indicates rising air, which allows clouds to form, bringing rain or snow. Fill in the blank.

physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

  1. High, high

  2. High, low

  3. Low , low

  4. Low, high

Show answer
Correct Option: B
Explanation:

High pressure indicates sinking air where clouds cannot form. Low pressure indicates rising air, which allows clouds to form, bringing rain or snow.

When a vehicle travels very fast, a region of ______ is created temporarily just behind it.

chemistry air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure variations in atmospheric pressure wind and rain uneven heating of earth

  1. High pressure

  2. Low pressure

  3. High density

  4. Cyclone

Show answer
Correct Option: B
Explanation:
When a vehicle moves very fast, a low pressure is produced temporarily and the wind nearby rushes in to fill its place.

Which of the following principle shows that if you increase air speed its pressure will decrease?

chemistry air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure variations in atmospheric pressure wind and rain uneven heating of earth

  1. Darwin principle

  2. Einstein principle

  3. Bohr principle

  4. Bernoulli's principle

Show answer
Correct Option: D
Explanation:
According to Bernoulli's principle, Fast moving air equals low air pressure while slow moving air equals high air pressure.
 Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. The same is applicable in case of gases also.

Increase in air speed is associated with ______________ .

chemistry air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure variations in atmospheric pressure wind and rain uneven heating of earth

  1. increasein air pressure

  2. decrease in air pressure

  3. increase in air temperature

  4. decrease in air temperature

Show answer
Correct Option: B
Explanation:
The increased wind speed is accompanied by a reduced air pressure.

A piece of paper is kept on the table.  You have to lift it from the table by blowing high-speed air over it. In which direction will you blow the air?

chemistry air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure variations in atmospheric pressure wind and rain uneven heating of earth

  1. Sideways

  2. In the upward direction

  3. In the downward direction

  4. In the upward direction below the table

Show answer
Correct Option: A
Explanation:
In order to lift the paper up from the table we need to blow air in sideways.

Two pieces of papers are held parallel. Air is blown with a high speed in between them. Which of the following phenomena will be observed?

chemistry air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure variations in atmospheric pressure wind and rain uneven heating of earth

  1. The papers will move away from each other.

  2. The papers will move towards each other.

  3. The papers will stay at their position.

  4. The papers will catch fire due to increase in air temperature.

Show answer
Correct Option: B
Explanation:
It seems amazing that the two sheets of paper move closer together, the pressure is reduced where the air is moving quickly. This is called the Bernoulli principle.