Tag: ozone and its depletion

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Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone layer of upper atmosphere is being destroyed by

  1. Chlorofluorocarbons
  2. $ { SO } _{ 2 } $

  3. Smog

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
$ { CFC } _{ s } $ are widely used as refrigerants. $ { CFC } _{ s } $ discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing CI atoms. CI degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; CI atoms are not consumed in the reaction. $ { CFC } _{ s } $ added to the stratosphere have permanent and continuing affects on ozone levels.
So, the correct answer is 'Chlorofluorocarbons'.
Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone hole means

  1. Hole in the stratosphere

  2. Same concentration of ozone

  3. Decrease in the concentration of ozone

  4. Increase in the concentration of ozone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone occurs in the concentration of up to 1 ppm in the stratosphere as compared to 0.5 ppm in the troposphere. Ozone is formed in the stratosphere from oxygen due to solar radiations. Maximum ozone concentration is found at a distance of 23 to 25 km above the equator and 11 to 16 km over poles. It is called as ozone layer or ozonosphere. 

Ozone protects the earth by filtering out ultra-violet radiations. The ozone layer has two variable holes, a larger over south pole or Antarctica and a minor one over the north pole. High speed jets usually fly in stratosphere causing depletion of ozone. A decrease in concentration of ozone is called as the ozone hole.

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Formation of ozone hole is maximum over

  1. India

  2. Antarctica

  3. Europe

  4. Africa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The thickness of ozone over the poles changes with the seasons being lowest in polar spring and maximum in polar autumn. Ozone hole refers to the depletion in the concentration of ozone over a restricted area as spring time decline over Antarctica. Spring time depletion of ozone is due to the action of sunlight over pollutants, which release chemicals like chlorine, that destroy ozone.

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone hole means

  1. Hole in the stratosphere

  2. Same concentration of ozone

  3. Decrease in concentration of ozone

  4. Increase in the concentration of ozone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ozone hole is not an actual hole in the atmosphere, but rather a significant thinning or depletion of the ozone layer concentration in the stratosphere.

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

In atmosphere , Ozone hole refers to

  1. A hole in ozone layer

  2. Decrease in ozone layer thickness in troposphere

  3. Decrease in thickness of ozone layer in stratosphere

  4. Increase in the thickness of ozone layer in troposphere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The region of stratosphere, at an altitude of 16-50km over equator and at a slightly lower altitude elsewhere having a thick sheet of ozone is known as ozonosphere. Decline in the thickness of ozone layer over a restricted area is called ozone hole. It was first discovered over Antarctica in 1985 by Dr. Joe C. Farman and his colleagues in the British Antarctica surveys. Chlorofluorocarbons are mainly responsible for ozone depletion in the stratosphere. CFC's are used as coolants in refrigerators and air conditioners, as propellants, cleaning solvents. Once released into the atmosphere, CFC'S reach the stratosphere and produce active chlorine in the presence of UV radiations. These radicals through chain reaction destroy ozone by converting it into oxygen.

Thus, the correct answer is option C. 

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

'Ozone-hole' means

  1. A large sized hole in the ozone layer

  2. Thinning of the ozone layer

  3. Small holes scattered in the ozone layer

  4. Thickening of ozone in the ozone layer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ozone layer is a region of concentration of ozone molecule. $O _3 (O _2+ O)$ in the earth's atmosphere. The layer lies in the stratosphere at an altitude of 18-50 kms. The ozone layer naturally Shields earth's life from the harmful effect of the Sun's ultraviolet radiations. A severe depletion of ozone (ozone hole) in a region of the ozone layer was found particularly over Antarctica.  The depletion is caused by chlorofluorocarbons and by other compounds like $CCI _4, CF _4$ etc. So, the correct answer is 'Thinning of the ozone layer'.

Multiple choice zoology natural resources - air, water and land ozone and its depletion ozone layer ozone layer depletion and causes

In which part of atmosphere, ozone layer is present?

  1. Stratosphere

  2. Troposphere

  3. Mesosphere

  4. Thermosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres above Earth, which shields the earth from the sun's harmful ultraviolet radiations. Ozone gas is present in 10 ppm in this ozone layer.

Multiple choice commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

Ozone hole means 

  1. A large sized in the stratosphere layer

  2. Thinning of the ozone layer at the poles

  3. Small holes scattered in the ozone layer

  4. Thickening of the ozone layer at the poles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that surrounding the troposphere of earth, there is a layer of the stratosphere. It is made up of ozone molecules that are formed by the effect of UV rays in these areas. Due to excessive chlorofluorocarbon compounds, and emission of carbon dioxide, it is getting depleted. At the poles, it is constantly getting thinner and thinner. This is called the ozone hole. 

So, option B is the correct answer.