Tag: air, winds and cyclones

Questions Related to air, winds and cyclones

At poles, how is the direction of Polar winds ?

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

  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

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Correct Option: A
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.

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.

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

  1. a d c b

  2. c d a b

  3. c a b d

  4. c a d b

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Correct Option: D
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.

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

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

  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

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Correct Option: C

Sea breeze and land breeze

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

  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

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Correct Option: A

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.

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

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Correct Option: A
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.

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

physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth

  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

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Correct Option: B