Tag: air, winds and cyclones

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Questions Related to air, winds and cyclones

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

At poles, how is the direction of Polar winds ?

  1. Air from Polar region moves in towards the $60^o$ latitude belt
  2. Air from the $60^o$ latitude belt moves in towards Polar region

  3. Air from Polar region moves in towards the equatorial region

  4. Air from equatorial region moves in towards the Polar region
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
At the poles, the air is colder than that at latitudes about 60 degrees. The warm air at these latitudes rises up and the cold wind from the polar regions rushes in, to take its place.
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

Arrange the following steps in the proper order to explain how a sea breeze occurs, near coastal regions.
(a) The temperature of land rises rapidly as compared to sea, because the specific heat capacity of land is five times less than that of water.
(b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land.
(c) The sun shines equally on the land mass and sea, giving equal amount of heat energy to both.
(d) The air above the land becomes hot and light, rises up and hence creates the low pressure over the land.

  1. a d c b

  2. c d a b

  3. c a b d

  4. c a d b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Near the coastal regions, when (c) the sun shines equally on the land mass as well as the sea giving an equal amount of heat energy.But (a) the temperature of land rises rapidly as compared to the sea water, as specific heat capacity of water is five times greater than that of land. So, water requires more heat energy to raises its temperature by $1^{\circ}C$. Then (d) the air above the land mass becomes hotter and lighter and hence rises up, which creates a low pressure over the land. (b) Due to the low pressure over the land mass, the cool air over the sea starts blowing towards the land, by this producing sea breeze.

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

If an ideal flask containing hot coffee is shaken, the temperature on the coffee will:

  1. decrease

  2. increase

  3. remain same
  4. decrease if temperature is below $4$C and increase if temperature is equal to or more than $4$C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An ideal flask is designed to be thermally insulated, meaning no heat is exchanged with the surroundings. Shaking the coffee adds a negligible amount of mechanical energy, so the temperature remains effectively the same.

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

Sea breeze and land breeze

  1. are caused by currents set up in air due to conduction

  2. are caused by currents set up in air due to convection

  3. are caused by currents set up in air due to radiation

  4. have no relation to conduction, convection and radiation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sea breezes and land breezes occur due to differential heating and cooling of land and water, which sets up convection currents in the atmosphere. Warm air rises and cooler air moves in to replace it, driven entirely by the process of convection.

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 whether true or false.
The land and sea breezes are based on the fact that the specific heat of vaporisation of steam is very high.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The statement is true.
The specific heat capacity of water is much higher than that of sand. Air above land becomes more warmer than water during day. So cold air above water or sea blows to land known as sea breeze and vice versa for land breeze.
Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

A small weight put on the pressure cooker increased the pressure of steam because.

  1. Density of metal is very high

  2. Area of contact is very small

  3. It is air tight

  4. Pressure builds up irrespective of the weight placed
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure is defined as force divided by area. By placing a weight on the pressure cooker's vent, the force is increased, and because the area of the vent is small, it significantly increases the pressure required for steam to escape.