21. Thunderstorms are associated with

1. 1. Cumulus clouds

   
   
   

   2. Cumulonimbus clouds

   
   
   

   3. Cirrus clouds

   
   
   

   4. Stratus clouds

   
   
   

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   Cumulonimbus clouds

   Correct Option: B

   Cumulonimbus clouds

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22. The hail is generally associated with which of the following clouds ?

1. 1. Cirrus

   
   
   

   2. Cumulus

   
   
   

   3. Cumulo-nimbus

   
   
   

   4. Stratus

   
   
   

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   The hail is generally associated with the cumulo-nimbus clouds. Cumulonimbus, from the Latin cumulus ("heap") and nimbus ("rainstorm", "storm cloud"), is a dense towering vertical cloud associated with thunderstorms and atmospheric instability, upward air currents.

   Correct Option: C

   The hail is generally associated with the cumulo-nimbus clouds. Cumulonimbus, from the Latin cumulus ("heap") and nimbus ("rainstorm", "storm cloud"), is a dense towering vertical cloud associated with thunderstorms and atmospheric instability, upward air currents.

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23. The clockwise movement of winds in the cyclones of southern hemisphere is mainly caused by

1. 1. Centrifugal force

   
   
   

   2. Deflective force

   
   
   

   3. Frictional force

   
   
   

   4. Pressure force

   
   
   

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   Deflective force

   Correct Option: B

   Deflective force

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24. Fog is a phenomenon indicating

1. 1. Low average temperature

   
   
   

   2. Normal lapse of temperature

   
   
   

   3. Inversion of temperature

   
   
   

   4. High average temperature

   
   
   

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   Inversion of temperature

   Correct Option: C

   Inversion of temperature

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25. Earth's Albedo is largely affected by

1. 1. Cloudiness

   
   
   

   2. Dust particles in atmosphere

   
   
   

   3. Atmospheric layer

   
   
   

   4. Nature of the earth's surface

   
   
   

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   Cloudiness

   Correct Option: A

   Cloudiness

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