61. 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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62. 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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63. What is a cloud ?

1. 1. It is a kind of mist

   
   
   

   2. It is a kind of frost

   
   
   

   3. It is a kind condensed form of dew

   
   
   

   4. It is a kind of fog lifted above the earth's surface

   
   
   

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   NA

   Correct Option: A

   NA

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64. Which of the following is not a low cloud ?

1. 1. Stratus

   
   
   

   2. Cirro stratus

   
   
   

   3. Nimbo stratus

   
   
   

   4. Cumulo nimbus

   
   
   

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   NA

   Correct Option: B

   NA

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65. The clouds float in the atmosphere because of their low

1. 1. pressure

   
   
   

   2. temperature

   
   
   

   3. density

   
   
   

   4. velocity

   
   
   

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   NA

   Correct Option: C

   NA

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