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Environmental Issues Test - 53

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Environmental Issues Test - 53
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Soil erosion can be checked by
    Solution

    Erosion can be checked in many ways. E.g. Maintaining a protective plant cover, Planting crops(grass or grains) in alternative strips can be adopted.

    • Using mulch or introducing crop rotation also reduces the duration of time the bare soil is exposed. 
    • Contour ploughing, building terraces that intercept and stop downward movement of soil. 
    • Netting is a temporary form of erosion control. 
    • Maintaining plant cover reduces wind speed. 
    • Growing crops in intervals across a field of cereals, and using trees and shrubs as shelterbelts or windbreaks are also helpful.
    • Taking pits at points at borders of the plot also is useful. 
    • Plant fencing is a conventional method. 
    So, the correct option is D. 

  • Question 2
    1 / -0

    Planting of trees along road sides will reduce _________in the air .
    Solution

  • Question 3
    1 / -0
    Which of the following is responsible for the 80% depreciation in the ozone layer?
    Solution
    • Chlorofluorocarbon accounts for 80% of the depletion of the ozone layer in the atmosphere. 
    • CFCs contain chlorine atoms which when exposed to UV radiations from chlorine ions. 
    • These chlorine ions react with the ozone molecule and remove an oxygen atom at a time and thus, breaking down ozone molecules. 
    • One atom of chlorine can decompose 100,000 molecules of ozone.
    Thus, the correct answer is option A. 
  • Question 4
    1 / -0
    The natural vegetation in a particular area is termed as 
    Solution

  • Question 5
    1 / -0
    Chlorofluorocarbons (CFCs) are believed to be associated with cancers because,
    Solution
    Chlorofluorocarbons released into the atmosphere have various ill-effects. These are used as coolants in refrigerators, coolers, etc. CFCs on reaching the atmosphere break the ozone molecule resulting in the formation of oxygen radical and $$O_2$$. This oxygen radical results in depletion of the ozone layer that leads to the penetration of the harmful UV radiations from the sun into the Earth's atmosphere. UV rays are responsible for cancer. Thus, the correct answer is option C. 
  • Question 6
    1 / -0
    Producer gas is formed by passing over hot biomass.
    Solution
    Producer gas is formed by passing over hot biomass over a mixture of steam and air.
    Correct answer-D
  • Question 7
    1 / -0
    Organic farming does not include ________.
  • Question 8
    1 / -0
    Which type of electron is present in free radical?
    Solution
    Free radicals have unpaired electrons. These are extremely reactive. As one chlorine free radical can remove 11000 ozone molecules from stratosphere.
  • Question 9
    1 / -0
    An important product in the ozone depletion by chlorofluorocarbons is:
    Solution
    A.Correct option-B
    B.Explanation for correct option-B

    • In $$CFCl_3$$, one chlorine atom gets release because of UV radiation in the stratosphere. 
    • This released chlorine atom then reacts with ozone. So, the important product in ozone depletion by chlorofluorocarbons is chlorine monoxide. 

  • Question 10
    1 / -0
    Elements can be diagonsed by
    Solution
    Element analysis by Atomic Emission Spectroscopy. These wavelength bands or emission lines form a pattern that is characteristic of the atom that produced it. Generally, the intensities of the various emission lines are proportional to the number of atoms in the test sample that produced the lines. When an atom absorbs energy, its electrons jump to higher energy levels. Each transition has a specific energy difference. This collection of transitions makes up an emission spectrum. These emission spectra are as distinctive to each element as fingerprints are to people.
    So, the correct answer is 'Emission spectroscopy'.
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