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Environmental Issues Test - 33

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Environmental Issues Test - 33
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following defines the effect of deforestation on the next generation?
    Solution
    As a result of deforestation, chances of desertification, droughts, floods, etc. increase. Deforestation can also increase the level of carbon dioxide in the Earth, it will lead to an increase in temperature i.e., global warming. As a result, the entire natural water cycle will get disrupted. This again increases the risk of natural calamities.
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    The harmful and unwanted substances which degrade the quality of water are called as ________.
    Solution
    Any external substance which changes the natural qualities of water is known as a water pollutant. These can be chemical or biological. These pollutants harm the natural quality of water causing water pollution.
    So, the correct option is $$A$$
  • Question 3
    1 / -0
    What are the consequences of deforestation?
    Solution
    Causes of deforestation are as follows:
    • Clearing land for human habitation and cultivation
    • The need of wood for building houses and factories.
    • The need of wood for making furniture.
    Consequences of deforestation are as follows:
    • Soil erosion
    • Depletion of groundwater
    • Flash flood
    • Global warming
    • Loss of biodiversity
    • Droughts and climate change due to global warming
  • Question 4
    1 / -0
    Deforestation generally decreases 
    Solution
    When forests are destroyed, the atmosphere, water bodies and the water table are all affected. Trees absorb and retain water in their roots and some of this moisture is transpired into the atmosphere, regulates the water cycle. When this process is broken, the atmosphere and water bodies begin to dry out. 
    Therefore, the correct answer is option A.
  • Question 5
    1 / -0
    Which of the following is an example of freon ?
    Solution
    $$CCl_{2}F_{2}$$ is an example of freon. It can act as an aerosol propellant, refrigerant, or organic solvent because it is  a gas at room temperature and a liquid when cooled or compressed.
    So, the correct answer is option A.
  • Question 6
    1 / -0
    Frequent floods in plains of Northern India is due to
    Solution
    Frequent floods in plains of Northern India is due to deforestation in catchment areas. Deforestation in the catchment area has led to an increase in the silt content of the river flow. Bihar is India's most flood-prone State, with 76% of the population in the north Bihar living under the recurring threat of flood devastation.
    Removal of vegetation cover has caused widespread erosion in Western Ghats, Uttar Pradesh and in Himachal Pradesh.
  • Question 7
    1 / -0
    Presence of CFCs in the atmosphere is responsible for
    Solution
    CFCs are used as coolants in refrigerators, coolers, etc. The CFCs causes the breaking of the ozone molecule which forms the oxygen radical and O$$_2$$. So, the presence of CFCs in the atmosphere results in the depletion of the ozone layer and allowing the penetration of the harmful UV radiations from the sun into the Earth's atmosphere. 
    Thus, the correct answer is option C. 
  • Question 8
    1 / -0
    Ozone layer is disturbed by
    Solution
    Ozone is a form of a blanket covering the upper atmosphere which protects the earth from harmful ultraviolet rays. Because of ozone depletion, these rays can now reach the earth through hole which was previously protected by ozone blanket. The various causes of ozone depletion are as follows:
    • Huge combustion of fossil fuel and organic matter.
    • Excessive use of nitrogenous fertilizers.
    • supersonic rockets and space shutters.
    • Nuclear test.
    • Excessive use of chlorofluorocarbons.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    BOD of a pond is related to .......... in per unit volume of water.
    Solution
    Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic microorganisms to break down organic material present in a given water sample at certain temperature over a specific period of time. Thus, the correct answer is option C.
  • Question 10
    1 / -0
    A water body has high BOD, indicating that water is
    Solution
    Biological oxygen demand (BOD) is one of the most common measures of pollutant organic material in water. BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water. The BOD test serves an important function in stream pollution-control activities.
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