Tag: air exerts pressure

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Questions Related to air exerts pressure

Multiple choice 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

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

  1. Darwin principle

  2. Einstein principle

  3. Bohr principle

  4. Bernoulli's principle
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice 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

Increase in air speed is associated with ______________ .

  1. increasein air pressure

  2. decrease in air pressure

  3. increase in air temperature

  4. decrease in air temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The increased wind speed is accompanied by a reduced air pressure.
Multiple choice 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

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?

  1. Sideways

  2. In the upward direction

  3. In the downward direction

  4. In the upward direction below the table
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In order to lift the paper up from the table we need to blow air in sideways.
Multiple choice 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

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?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 
Multiple choice physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

Why is warm air lighter than cold air?

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

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

  1. moves downwards, equator

  2. rises, pole

  3. rises, equator

  4. moves downwards, pole
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The warm air at the latitudes rises up and the cold wind from the polar regions rushes in, to take its place.
Multiple choice physics air, winds and cyclones the concept of bernoulli's principle air exerts pressure wind and pressure wind and rain uneven heating of earth

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

  1. warmer

  2. colder

  3. heavier

  4. lighter
Reveal answer Fill a bubble to check yourself
A,D Correct answer
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.