Tag: global environmental change

Quizzes (7) Questions (240)

Questions Related to global environmental change

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which of the following conditions lead to formation of ozone?

  1. When oxygen molecules absorb ultraviolet photons and undergo photolysis

  2. When carbon molecules absorb ultraviolet photons and undergo photolysis

  3. When oxygen molecules absorb ultraviolet electrons and undergo photolysis

  4. When oxygen molecules absorb ultraviolet neutrons and undergo photolysis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


When oxygen molecules absorb ultraviolet photons and undergo photolysis, ozone is obtained
$3O _2 \xrightarrow [photolysis]{UV : light} 2O _3$.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

40 to 50% depletion in ozone layer occurs in the .......... polar region

  1. North

  2. South

  3. East

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

40 to 50% depletion in ozone layer occurs in the South polar region.
Ozone is destroyed by collisions with other atoms and molecules.
The large scale destruction of the stratospheric ozone first came into focus in 1987 through the experiments in antarctica.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Depletion of ozone layer is mainly due to

  1. Methane

  2. Carbon dioxide

  3. Chloroflorocarbons

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Depletion of ozone layer is mainly due to Chloroflorocarbons.
Note:
The following describes the destruction of the ozone by chlorofluorocarbons.
Chlorofluorocarbons contains the chlorine molecule which reacts with ozone (O$ _3$) molecule and splits into O$ _2$ and O molecules.
Chlorofluorocarbons are used in refrigerators, air conditioners and aerosol sprays. They damage the ozone layer of the atmosphere.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Destruction of ozone can cause 

  1. Skin cancer

  2. Cataract

  3. Hinder growth of plant

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Destruction of ozone can cause skin cancer, cataract and can hinder growth of plant. Ozone prevents the harmful radiations from reaching the surface of earth. The UV radiation has enough energy to cause adverse effects on all life systems, especially humans. It can destroy parts of DNA molecules that stores and propagate genetic information from one generation to another generation.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Chlorofluorocarbons cause

  1. Global warming

  2. Eutrophication of lakes

  3. Depletion of the ozone layer

  4. Magnification in the food chain

  5. Acid rain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Chlorofluorocarbons (CFC) also known as freons which cause a destruction of ozone layer found in the stratospheric layer. The ozone layer in the atmosphere prevents the harmful UV rays from reaching the earth surface. When this ozone layer gets depleted, harmful UV rays causes skin cancer. 
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which of the following is the result of use of chlorofluorocarbons?

  1. Global warming

  2. Eutrophication of lates

  3. Depletion of the ozone layer

  4. Magnification in the food chain

  5. Acid rain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A chlorofluorocarbon (CFC) is composed of carbon, chlorine, and fluorine. This is used in refrigerants, propellants, and solvents. The chlorine atoms are released due to splitting of CFC by ultravoilet radiation.

So, the correct answer is option C.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Ozone in the stratosphere is depleted by

  1. $C _6F _6Cl _6$
  2. $C _7F _{16}$
  3. $CF _2Cl _2$
  4. $C _6F _6$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The presence of CFCs in the atmosphere results in the depletion of the ozone layer. The chemical formula of this substance is CF$ _2$Cl$ _2$. They are used as coolants in refrigerators, coolers, etc. The CFCs causes the breaking of the ozone molecule which forms the oxygen radical and O$ _2$. The depletion of the ozone layer results in the penetration of the harmful UV radiations from the sun into the Earth's atmosphere. 

Thus, the correct answer is option C. 

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Good ozone is found in 

  1. Atmosphere

  2. Biosphere

  3. Stratosphere

  4. Ozonosphere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct answer is Stratosphere. Option C

Ozone occurs in the Earth's upper atmosphere—10 to 30 miles above the Earth's surface and protects from the sun's harmful ultraviolet (UV) rays Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which one of the following chemicals is responsible for the reduction of ozone content of atmosphere?

  1. Hydrochloric acid

  2. Photochemical smog

  3. Chlorofluorocarbon (CFC)

  4. Sulphur dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorofluorocarbons or Chlorofluoromethane are also known as freon or aerosols. They are chemicals used as refrigerants, propellants and solid plastic foams. These chemicals are also released as aerosols by jets flying at high altitudes. Along with nitrogen oxides, chlorofluorocarbons react with ozone of ozonosphere and depletes the same. Chlorofluorocarbons release reactive chloride which directly reacts with ozone molecules setting a chain reaction.