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

In coming years, skin related disorders will be more common due to:

  1. Pollutants in air

  2. Use of detergents

  3. Water pollution

  4. Depletion of ozone layer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thinning of ozone layer increases the amount of ultraviolet radiations reaching the earth surface. The increased UV-B radiation increases incidence of cataract, skin cancers herpes, dimming of eyesight, photo burning, snow blindness and deficient functioning of immune system. 

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

Of the following, which is a greenhouse gas?

  1. Nitrogen dioxide

  2. Sulphur dioxide

  3. Carbon dioxide

  4. Carbon monoxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Greenhouse gases generally traps the radiations of the earth which leads to increase in the temperature of the earth and is the major cause for global warming. The greenhouse gases includes water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
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

Freon gas causing stratosphere $O _3$ depletion is mainly released from

  1. Refrigerators

  2. Automobiles

  3. Thermal power plants

  4. Steel industry
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Freon gas is a type of chlorofluorocarbon (CFC) i.e., it contains carbon and hydrogen along with fluorine and chlorine. It is used as a refrigerant. CFCs release chlorine atoms in the atmosphere that react with ozone and cause its depletion. Hence, Freon causes ozone depletion and it is released from refrigerators.
So, the correct answer is 'Refrigerators'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Maximum ozone depletion is caused by

  1. $CO _2$

  2. CFC
  3. $SO _2$
  4. $CH _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The primary cause for ozone depletion are CFCs. CFCs or Chlorofluorocarbons are the compounds that contain carbon and hydrogen along with chlorine and fluorine. They are used as refrigerants and in air conditioners. CFCs release chlorine radicals that react with ozone and cause its degradation. The mechanism of ozone depletion by CFC is as follows:
              UV- C
CFCl3 ----------------> CFCl2 + Cl
               UV-C
CFCl2 -----------------> CFCl + Cl
Cl + O3 ----------------> ClO + O2
ClO + O3 --------------> Cl + 2O2
Hence, CFC causes degradation of ozone. Also, the chlorine atom remains in the atmosphere and reacts with another molecule of ozone.
So, the correct answer is 'CFC'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Excessive exposure of humans to UV-rays results in

  1. damage to immune system

  2. damage to lungs

  3. skin cancer

  4. peptic ulcers
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation
UV rays or ultraviolet rays can affect human health in many ways like causing skin cancer and a weakening immune system. Excessive exposure to UV rays can lead to skin cancer because the UV rays cause damage to the DNA in skin cells. UV rays also affect the distribution and activity of cells that trigger immune responses thus, making the immune system weak. UV rays first affect the skin and the whole body.
So, the correct answer is option A and C i.e. 'damage to immune system' and 'skin cancer'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which of the following are main responsible for ozone depletion?

  1. Chlorofluorocarbons

  2. Hydrocarbons

  3. Carbon monoxide

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Ozone depletion occurs when chlorofluorocarbons (CFCs) present in aerosols and refrigerants are released into the stratosphere. 
  • Ultraviolet radiations from the sun break these CFCs molecules and release the chlorine atoms.
  • Chlorine atom reacts with the ozone (O3) molecules and starts the ozone destruction cycle.
  • So, the correct answer is 'Chlorofluorocarbons'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Ozone layer depletion may lead to which of the following harmful effects in organisms?

  1. Skin cancer

  2. Cataract

  3. Damage to the immune system

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

Ozone gas is found in the stratosphere of the atmosphere. The ozone layer protects the earth from the harmful ultraviolet rays emitted from the sun. Ozone layer depletion has many adverse serious environmental effects. It may result in global warming. The ultraviolet radiations exposure leads to skin cancer like malignant melanoma. It also increases the rate of ageing in an individual. It also has harmful effect on the eyes. It may cause cataract. Immune system is also affected by this harmful ultraviolet radiations. Apart from humans, ozone layer depletion affects marine, aquatic and other forms of life as well.

Thus, the correct answer is 'All of the above.'

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

Which harmful radiations are absorbed by ozen layer?

  1. UV

  2. X-RAY

  3. Visible light

  4. Gamma rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The ozone layer or ozone($O _3$) shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet(UV)radiation.
  • Overexposure to UV radiation may cause skin cancer, damage of the eye and the suppression of the immune system.
  • Hence The harmful radiations are absorbed by ozone layer UV.
  • So, the correct answer is 'UV'.
Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Why ozone is known as 'chemical weed ' ?

  1. Because it is formed by chemical reactions

  2. Because it is harmful as well useful

  3. Because it is harmful, just like weeds for mankind

  4. Ozone is not designated as chemical weed
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ozone is an inorganic molecule and a light blue gas with a pungent odor that is prevalent in the stratosphere just below the atmosphere of the earth. Without ozone, plants and animals would be receiving so much radiation from the sun that it would be difficult, if not impossible, for life to even survive here. The effects of no ozone to protect these harmful rays would be that all life here on earth would soon burn up, essentially. Although most associated with the atmosphere, ozone is also a powerful oxidant with many industrial and consumer uses. However, it must be used with extreme caution. The high oxidizing potential of ozone causes damage to mucous and respiratory tissues in animals and also damages tissue in plants at extremely high levels. In commercial agriculture, ozone can be used in conjunction with other chemicals and gases as a control for certain noxious weeds or pests.


So, the correct option is 'Option A', Because it is formed by chemical reactions.

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

_____________ is the first country to have phased out the CFCs and HCFCs which are responsible for the depletion of the ozone layer

  1. Denmark

  2. Germany

  3. France

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

Germany is widely recognized for its early and proactive implementation of policies to phase out ozone-depleting substances like CFCs and HCFCs. They were among the first to comply with international protocols.