Tag: air exerts pressure

Questions Related to air exerts pressure

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

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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

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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.

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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. 

Why is warm air lighter than cold air?

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. Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.

  2. Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.

  3. Due to heating, air expands. When same mass occupies more volume it becomes lighter.

  4. Due to heating, air contracts. When same mass occupies less volume it becomes lighter.

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Correct Option: C
Explanation:
Warm air lighter than cold air because on heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter.

The air just above the flame of burning candle will ____________.

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. Rise up

  2. Moves down

  3. Moves sideways

  4. It will not move in any direction.

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Correct Option: A
Explanation:
The burning candle releases hot air, and we know hot air rises up.

The warm air ___, and the cooler air from the regions in the 030 degrees latitude belt on either side of the ____moves in.

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. moves downwards, equator

  2. rises, pole

  3. rises, equator

  4. moves downwards, pole

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Correct Option: C
Explanation:
The warm air at the latitudes rises up and the cold wind from the polar regions rushes in, to take its place.

Choose the correct options (one or more) 
At the equator, the air is _____ than that at latitudes about 30 degrees.

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. warmer

  2. colder

  3. heavier

  4. lighter

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Correct Option: A,D
Explanation:
As we know regions close to the equator get maximum heat from the Sun. Hence, the air in these regions gets warm and warm air is lighter and rises up.

Choose the correct options (one or more)
At the poles, the air is _____ than that at latitudes about 60 degrees.

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. warmer

  2. colder

  3. lighter

  4. Heavier

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Correct Option: B,D
Explanation:
At the poles, the air is colder than that at latitudes about 60 degrees and cold air is heavier than warm air.

State whether true or false :
"Moisture" refers to the presence of liquid generally water in very trace amounts.

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. True

  2. False

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Correct Option: A
Explanation:

The correct answer is option(A).

Moisture is the presence of a liquid, especially water, often in trace amounts.