Power Systems
One Kg of natural uranium gives energy equivalent to about

 1000 Kg of coal.
  10500 Kg of coal.
 100 Kg of coal.
 5000 Kg of coal.

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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the storage is provided.
  the difference of water level between the level in storage and tail race.
 the height of water level in the river where the tail race is provided.
 all of above.

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