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MCQs

Total Questions : 560 | Page 7 of 56 pages
Question 61. A 'stratosphere' is a well recognized region of atmosphere, having
  1.    20-90km Altitude
  2.    10 to 50km Altitude
  3.    20-40km Altitude
  4.    10-70km Altitude
 Discuss Question
Answer: Option B. -> 10 to 50km Altitude
Answer: (b).10 to 50km Altitude
Question 62. 'ppb' stands for
  1.    Parts per thousand Volume
  2.    Parts per thousand trillin
  3.    Parts per thousand Million
  4.    Parts per thousand Billion
 Discuss Question
Answer: Option D. -> Parts per thousand Billion
Answer: (d).Parts per thousand Billion
Question 63. Ozone' and 'CFCs' are destroyed by
  1.    Natural process
  2.    Artificial Process
  3.    Antropogenic Activities
  4.    Cemical process
 Discuss Question
Answer: Option A. -> Natural process
Answer: (a).Natural process
Question 64. 'CFCs' in atmosphere destroys
  1.    Nitrous Oxide
  2.    Ozone
  3.    Nitrogen
  4.    Carbon dioxide
 Discuss Question
Answer: Option B. -> Ozone
Answer: (b).Ozone
Question 65. A molecule consisting of three atoms of oxygen is
  1.    Ozone
  2.    Nitrous Oxide
  3.    Carbon dioxide
  4.    Nitrogen
 Discuss Question
Answer: Option A. -> Ozone
Answer: (a).Ozone
Question 66. CFCs are ideal to use in refrigerators and
  1.    Cosmetics
  2.    Detergents
  3.    Chemicals
  4.    Aerosol spray cans
 Discuss Question
Answer: Option D. -> Aerosol spray cans
Answer: (d).Aerosol spray cans
Question 67. Perfluorocarbons (e.g. CF₄, C₂F₆) and sulphur hexafluoride (SF₆) has a long lasting atmospheric
  1.    Reaction
  2.    Lifetime
  3.    chain Reactions
  4.    Chemical Reaction
 Discuss Question
Answer: Option B. -> Lifetime
Answer: (b).Lifetime
Question 68. Lifespan of 'CFCs' are:
  1.    900 years
  2.    3-600 years
  3.    1-200 years
  4.    3-600 years
 Discuss Question
Answer: Option C. -> 1-200 years
Answer: (c).1-200 years
Question 69. What suffers most due to tropospheric ozone?
  1.    Health
  2.    Environment
  3.    Society
  4.    All of above
 Discuss Question
Answer: Option A. -> Health
Answer: (a).Health
Question 70. CFCs can be repleced by other halocarbos, such as
  1.    Hydrochlorofluorocarbon
  2.    Hydro carbons
  3.    Carbon dioxide
  4.    Halogen
 Discuss Question
Answer: Option A. -> Hydrochlorofluorocarbon
Answer: (a).Hydrochlorofluorocarbon

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