Tag: causes of resource depletion

Questions Related to causes of resource depletion

Which chemical is a 'ozone' depleting solvent?

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

  1. PAN

  2. CFCs

  3. Carbon tetrachloride

  4. Nitrogen

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Correct Option: C

Chlorine free radical reacts with 'ozone' to form

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

  1. CFCs

  2. Chlorine Oxide

  3. $N _{2}$

  4. Bromine Oxide

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Correct Option: B

What is involved in ozone depletion?

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

  1. Chlorofluorocarbons (CFCs)

  2. Carbon tetrachloride (CCl4)

  3. Carbon tetrafluoride (CF4)

  4. All of above

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Correct Option: D

'Nitric acid' reacts with ozone, resulting in removal of

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

  1. $O{3}$

  2. CO

  3. $CO{2}$

  4. NoX

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Correct Option: A

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

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

  1. Geneva

  2. Vienna

  3. London

  4. Frankfurt

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Correct Option: B

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

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

  1. Hydrogen

  2. Carbon

  3. Chlorine

  4. Flourine

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Correct Option: C

Which among the following are the consequences of ozone depletion?

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

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

  2. Various skin troubles like skin cancer

  3. Cataract

  4. All of the above

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Correct Option: D
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.

Ozone-layer is getting depleted because of

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

  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.

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Correct Option: C
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.

Ozone hole enhances

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

  1. UV radiations reaching earth

  2. Number of cataracts

  3. Skin cancers

  4. All of the above

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Correct Option: D
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.

In the environment, ozone is known for its 

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

  1. Harmful effects

  2. Useful effects

  3. Both A and B

  4. Inert nature

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Correct Option: C
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.