121. When warm air moves into a region of cold air it leads to the formation of

1. 1. Cold front

   
   
   

   2. Warm front

   
   
   

   3. Cyclone

   
   
   

   4. Anticyclone

   
   
   

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   NA

   Correct Option: B

   NA

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122. Jet streams blows

1. 1. From west to east

   
   
   

   2. From east to west

   
   
   

   3. From north to south

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: A

   NA

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123. Which of the following is not a necessary condition for the formation of heavy rainfall

1. 1. Air must be warm near the surface

   
   
   

   2. Moist air must rise to great heights

   
   
   

   3. Air must becomes saturated

   
   
   

   4. Air pressure must be high

   
   
   

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   NA

   Correct Option: A

   NA

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124. Wind is often found to blow in a hot summer day due to

1. 1. Conduction of heat between air and soil on the Earth

   
   
   

   2. Radiation from the soil

   
   
   

   3. Convection current of air

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: A

   NA

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125. Winds are the caused torimarily by

1. 1. Coriolis effect

   
   
   

   2. Pressure difference

   
   
   

   3. Rotation of earh

   
   
   

   4. Humidity differences

   
   
   

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   NA

   Correct Option: A

   NA

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