Tag: air, winds and cyclones

Questions Related to air, winds and cyclones

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.

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
Correct Option: A
Explanation:

The correct answer is option(A).

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

"Water vapor" refers to :

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. liquid state of water

  2. solid state of water

  3. invisible gaseous state of water

  4. None of these

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Correct Option: C
Explanation:
Water vapour or aqueous vapour is the gaseous phase of water.

The continuous spectrum is obtained when the incandescent substance is?

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. In state of atomic vapour

  2. In solid state

  3. In state of molecular vapour

  4. None of these

Show answer
Correct Option: B
Explanation:

An incandescent light bulb produces a continuous spectrum because the source of the light is a metal filament (i.e. solid).

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.