Tag: air, winds and cyclones

Quizzes (4) Questions (46)

Questions Related to air, winds and cyclones

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.
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 continuous spectrum is obtained when the incandescent substance is?

  1. In state of atomic vapour

  2. In solid state

  3. In state of molecular vapour

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

During day time air blows-

  1. from the land to the sea

  2. from the sea to the land

  3. from one sea to another

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

State True and False :
During the day, land gets heated faster than water.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.