66. Clouds are formed by the

1. 1. Condensation of water vapour in the atmosphere

   
   
   

   2. Evapouration of water from ocens

   
   
   

   3. Rising currents of air

   
   
   

   4. Descending currents of air

   
   
   

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   NA

   Correct Option: A

   NA

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67. Which of the following statement is / are correct

1. 1. High clouds - Cirrocumulus, Cirrus, Cirrostratus

   
   
   

   2. Middle clouds - Altostratus, Altocummulus

   
   
   

   3. Low clouds - Cumulus, Stratocumulus, Nimbostratus, Stratus

   
   
   

   4. All of the above

   
   
   

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   NA

   Correct Option: D

   NA

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68. Clouds usually form when

1. 1. air temperature reaches the dew point

   
   
   

   2. evapouration has warmed the surrounding air

   
   
   

   3. relative humidity is 0%

   
   
   

   4. condensation nuclei have been removed from the air

   
   
   

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   NA

   Correct Option: A

   NA

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69. Water vapour has several very important functional roles on our planet. These are

1. 1. It redistributes heat energy on the Earth through latent heat energy exchange

   
   
   

   2. The condensation of water vapour creates precipitation that falls to the Earth's surface providing needed fresh water for plants and animals

   
   
   

   3. It helps warm the Earth's atmosphere through the greenhouse effect

   
   
   

   4. All of the above

   
   
   

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   NA

   Correct Option: D

   NA

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70. Which one of the following is the correct sequences in terms of descending values of Albedo ?

1. 1. Forest, snow, water

   
   
   

   2. Snow, forest, water

   
   
   

   3. water, snow, forest

   
   
   

   4. Forest, water, snow

   
   
   

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   NA

   Correct Option: B

   NA

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