Tag: causes of resource depletion

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Questions Related to causes of resource depletion

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

Which chemical is a 'ozone' depleting solvent?

  1. PAN

  2. CFCs

  3. Carbon tetrachloride

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

Carbon tetrachloride (CCl4) is a well-known ozone-depleting substance historically used as a solvent in industrial and laboratory applications. While CFCs are also ozone-depleting, the question specifically asks for a solvent.

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

What is involved in ozone depletion?

  1. Chlorofluorocarbons (CFCs)

  2. Carbon tetrachloride (CCl4)

  3. Carbon tetrafluoride (CF4)

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

Chlorofluorocarbons (CFCs) and carbon tetrachloride (CCl4) are both significant ozone-depleting substances. Carbon tetrafluoride (CF4) is also recognized as a greenhouse gas with potential atmospheric impacts, making all listed options contributors to the broader issue.

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

At which of the following places First Global Conference on depletion of Ozone layer was held?

  1. Geneva

  2. Vienna

  3. London

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

The Vienna Convention for the Protection of the Ozone Layer was the first global conference and treaty, held in 1985, to address the issue of ozone depletion.

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

The Hydrochlorofluorocarbons (HCFCs) are the compounds which have the following molecules:HydrogenCarbonChlorineFluorineWhich among the above plays the most important role in Ozone depletion?

  1. Hydrogen

  2. Carbon

  3. Chlorine

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

In HCFCs, the chlorine atom is the primary agent that is released in the stratosphere and participates in the catalytic cycle that destroys ozone molecules.

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

Which among the following are the consequences of ozone depletion?

  1. Entry of UV-rays in earth's atmosphere

  2. Various skin troubles like skin cancer

  3. Cataract

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

Ozone depletion in the stratosphere has resulted in formation of a large area of thinned ozone layer, commonly called as the ozone hole. UV radiation of wavelengths shorter than UV-B, are almost completely absorbed by Earth's atmosphere, given that the ozone layer is intact. But, UV-B damages DNA and mutation may occur. It causes aging of skin, damage to skin cells and various types of skin cancers. In human eye, cornea absorbs UV-B radiation, and a high dose of UV-B causes inflammation of cornea, called as snow-blindness, cataract, etc. Such exposure may permanently damage the cornea. Thus, the correct answer is option D.

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

Ozone-layer is getting depleted because of

  1. Excessive use of automobiles

  2. Excessive formation of industrial units

  3. Excessive use of man made compounds containing both fluorine and chlorine

  4. Excessive deforestation.
Reveal answer Fill a bubble to check yourself
C 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.

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

Ozone hole enhances

  1. UV radiations reaching earth

  2. Number of cataracts

  3. Skin cancers

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The ozone layer is mainly found in the stratosphere. Ozone layer acts as a shield that absorbs ultraviolet radiation from the sun. Due to ozone depletion by the presence of CFC gas the UV rays reaching the earth and causing harmful effects. UV rays are highly injurious to living organisms since DNA and proteins of living organisms preferentially absorb UV rays and its high energy breaks the chemical bonds within these molecules. UV-B damages DNA and mutation may occur. It causes aging of the skin, damage to skin cells and various types of skin cancers. In the human eye, cornea absorbs UV-B radiation, and a high dose of UV-B causes inflammation of the cornea, called as snow-blindness, cataract, etc. Such exposure may permanently damage the cornea. Therefore, the correct answer is option D.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

In the environment, ozone is known for its 

  1. Harmful effects

  2. Useful effects

  3. Both A and B

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

Ozone is an inorganic molecule. It is a pale blue gas with a distinctively pungent smell. In the environment ozone is known for its both harmful and useful effects.
Ozone present in stratosphere is useful as it act like shield and protect the earth from harmful UV-rays which can cause serious problems like skin cancer and decrease in level of photosynthesis. Ozone present in troposphere act as pollutant and have many deleterious effects. 

Therefore, the correct answer is option C.