81. Consider the following statements.
    1. Ozone is found mostly in the Stratosphere.
    2. Ozone layer lies 55-75 km above the surface of the earth.
    3. Ozone absorbs ultraviolet radiation from the Sun.
    4. Ozone layer has no significance for life on the earth.
    Which of the above statements are correct ?

1. 1. 1 and 3

   
   
   

   2. 2 and 4

   
   
   

   3. 2 and 3

   
   
   

   4. 1 and 4

   
   
   

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   NA

   Correct Option: A

   NA

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82. Which one of the following statements related to both land and sea breezes are true ?

1. 1. Air blows from the sea to the land during the day.

   
   
   

   2. Air blows from the land to the sea during the night

   
   
   

   3. Air generally moves from a cool region to a warmer region

   
   
   

   4. The lands cool more quickly than the sea during the night

   
   
   

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   NA

   Correct Option: C

   NA

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83. Assertion (A) : The elevation increases, the amount of space between air particles increases causing less ability to transfer heat to the ground
    Reason (R) : The higher the elevation, the cooler the climate.

1. 1. If (A) and (R) are true and (R) is the correct explanation of (A)
      

   
   
   

   2. If (A) and (R) are true but (R) is not the correct explanation of (A)
      

   
   
   

   3. If (A) is true but (R) is false
      

   
   
   

   4. If (A) is false but (R) is true
      

   
   
   

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   NA

   Correct Option: A

   NA

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84. Assertion (A) : Within the mesosphere, temperature decreases with increasing altitude.
    Reason (R) : This is due to deveasing solar heating and increasing cooling by CO₂ radiative emission
    

1. 1. If (A) and (R) are true and (R) is the correct explanation of (A)
      

   
   
   

   2. If (A) and (R) are true but (R) is not the correct explanation of (A)
      

   
   
   

   3. If (A) is true but (R) is false
      

   
   
   

   4. If (A) is false but (R) is true
      

   
   
   

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   NA

   Correct Option: A

   NA

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85. The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation ?
    1. There are no clouds or water vapour in the lower stratosphere.
    2. There are no vertical winds in the lower stratosphere.
    Which of the statements given above is / are correct in this context ?

1. 1. 1 only

   
   
   

   2. 2 only

   
   
   

   3. Both 1 and 2

   
   
   

   4. Neither 1 nor 2

   
   
   

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   NA

   Correct Option: C

   NA

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