Tag: in search of the source of wind

Questions Related to in search of the source of wind

When the sun is overhead on the Tropic of Capricorn (22st December) the pressure belts shift _____________.

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. $5^0N$

  2. $5^0S$

  3. $15^0N$

  4. $15^0S$

Show answer
Correct Option: B
Explanation:
$5^0S$
When the sun is overhead on the Tropic of Cancer (21 June) the pressure belts shift 5° northward and when it shines vertically overhead on Tropic of Capricorn (22 December), they shift 5° southward from their original position.

Because the axis of the Earth is tilted. If the Earth rotated upright the sun will always shine perpendicular to the Equator so the pressure belts would not move. But the Earth’s axis is slightly tilted. So in Summer, the northern hemisphere is pointed to the sun and in Winter southern hemisphere is pointing away from the sun. That is why days are longer in summer than in winter. The pressure belts move with the energy the sun provides. So if it is Summer in the Northern Hemisphere the pressure belts move towards the north. If it is Summer in the Southern Hemisphere, the pressure belts move further south.

What does the word doldrum means?

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. The zone of severe wind

  2. The zone of no wind

  3. The zone of torrential rain

  4. The zone of storms

Show answer
Correct Option: B
Explanation:

The trade winds blow equatorward from the sub-tropical belts of high pressure in the northern and southern hemispheres. Within this belt, the winds are light and variable with frequent calms. That is why this belt is called the doldrums. The word doldrum means the zone of no wind.

Subtropical high pressure belt lies close to the _______________.

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. Equator

  2. Tropic of Cancer and Tropic of Capricorn

  3. North pole

  4. South pole

Show answer
Correct Option: B
Explanation:
Tropic of Cancer and Tropic of Capricorn
As it moves towards the mid-latitudes on both sides of the equator, the air cools and sinks. The resulting air mass subsidence creates a subtropical ridge of high pressure near the 30th parallel in both hemispheres.
The Tropic of Cancer is currently positioned at approximately 23.4 degrees north of the Equator. The Tropic of Capricorn is 23.4 degrees south of the Equator. The area between the Tropic of Cancer and the Tropic of Capricorn is often called the Tropics.

Which of the following statement is true regarding Subtropical high pressure belt?

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. The warm air that ascends at the equator cools down and sinks here.

  2. The air from $60^0N-60^0S$ of the equator also descends here to create a high pressure region.

  3. The temperature in this latitude is low, so the expansion and ascent of air is minimal.

  4. All of the above

Show answer
Correct Option: D
Explanation:

Subtropical high-pressure belt,

Subtropical high-pressure belt is a high-pressure area that exists along 30° N and 30° S.
The sun is the ultimate source of energy that drives the earth’s weather. Most of the energy reaches the equatorial regions and the least energy reaches the poles, causing the tropics to warm and the poles to cool.
The earth’s atmosphere redistributes this heat imbalance through a complex set of atmospheric circulation patterns. The warm air at the low latitudes rises and moves toward the poles. The rising air, and the subsequent clouds and precipitation, cause the tropics to be very wet. In other words – as we go away from the equator towards the poles, temperature drops.

The warm air at the equatorial region rises up to a height of 10 to 15 km above the surface and moves towards the poles. On its way, it comes down or sinks at the subtropical region. This pattern of atmospheric circulation from the equator to the subtropical region is called Hadley Cell. It is named after George Hadley who was a famous meteorologist and he proposed this mechanism.

As the air moves towards the subtropics i.e. 30° N and 30° S, the air descends over the oceans and creates a high-pressure zone. In the Northern Hemisphere, these high-pressure systems are located over the North Pacific and North Atlantic oceans.

The famous Bermuda Triangle is also located at the North Atlantic Ocean and that’s a high-pressure zone. So, if anyone asks you the secret of the Bermuda triangle, this is the possible logical reason.

The air that moves from the equator towards subtropical region, that air is warm. And then you also have to understand, that there is cold air that is flowing towards the low latitudes from the poles. You see atmospheric circulation redistributes the heat on earth and that means cold and warm air keeps moving from one place to another.

When the sun is overhead on the Tropic of Cancer (21st June) the pressure belts shift ____________.

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. $5^0N$

  2. $10^0N$

  3. $5^0S$

  4. $10^0S$

Show answer
Correct Option: A
Explanation:
$5^0N$
When the sun is overhead on the Tropic of Cancer (21 June) the pressure belts shift 5° northward and when it shines vertically overhead on Tropic of Capricorn (22 December), they shift 5° southward from their original position.

Because the axis of the Earth is tilted. If the Earth rotated upright the sun will always shine perpendicular to the Equator so the pressure belts would not move. But the Earth’s axis is slightly tilted. So in Summer, the northern hemisphere is pointed to the sun and in Winter southern hemisphere is pointing away from the sun. That is why days are longer in summer than in winter. The pressure belts move with the energy the sun provides. So if it is Summer in the Northern Hemisphere the pressure belts move towards the north. If it is Summer in the Southern Hemisphere, the pressure belts move further south.

Consider the following statements.
1. The sub tropical high-pressure belts exists at 30 degree north latitude and 30 degree south latitude.
2. The polar high-pressure belt experiences severe cold throughout the year. As a result, the air remains chilled under the extreme cold that prevails over the poles.
Choose the wrong statement using the codes below.

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. only 1

  2. only 2

  3. both 1 and 2

  4. neither 1 nor 2

Show answer
Correct Option: D
Explanation:

 The sub tropical high pressure belts exists at 30 degree north latitude and 30 degree south latitude.The polar high pressure belt experiences severe cold throughout the year. As a result,the air remains chilled under the extreme cold that prevails over the poles.

The air is colder at this zone. Though the cold air remains close to the earth, the air is thrown up due to the rotation of the earth.As a result,low pressure is experienced all along this zone.
The zone here refers to _________________.

geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

  1. Equatorial low pressure belt.

  2. Sub tropical low pressure belt.

  3. Sub Polar low pressure belt.

  4. Polar low pressure belt.

Show answer
Correct Option: C

Doldrums are _________.

geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts

  1. regions of the Atlantic and Pacific oceans

  2. regions of the planets 

  3. regions of the earth

  4. none of the above

Show answer
Correct Option: A
Explanation:

Doldrums are regions of the Atlantic and Pacific oceans that have little if any wind. Doldrums are caused by solar radiation from the sun, as sunlight beams down directly on area around the equator. This heating causes the air to warm and rise straight up rather than blow horizontally. The result is little or no wind, sometimes for weeks on end. The Doldrums are located a little north of the equator, but the effects can be felt from 5 degrees north of the equator to 5 degrees south of it. This was a particular problem for sailors in the past when they depended on the winds to propel their ships. It was a problem that could be potentially deadly.

Altimeter is a device to measure  ____________.

geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts

  1. Temperature

  2. Height

  3. Altitude

  4. Rainfall

Show answer
Correct Option: B
Explanation:

Altimeter is an instrument that measures the height of the land surface or any object such as an airplane. The most common types of altimeters are barometric. They determine altitude by measuring air pressure. As altitude increases, air pressure decreases. This is because the density of air is lower at high altitudes. Altimeters are important navigation instruments for aircraft and spacecraft pilots who monitor their height above the Earth’s surface. Skydivers and mountaineers also use altimeters to pinpoint their location in the sky or on the ground.

In normal conditions, atmospheric pressure varies with__________ 

geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts the concept of bernoulli's principle air exerts pressure

  1. Height 

  2. Altitude

  3. Rainfall

  4. Temperature

Show answer
Correct Option: A,B
Explanation:

 
  • Both atmospheric pressure and  the density of air decrease with altitude.
  • This is due to the fact that air molecules are constantly being pulled downwards (towards the center of the Earth) by Gravity.
  •  So, air molecules are tightly packed near the surface of the earth, compared to some higher altitude.