Physics
In hydro power station, the motion produced in turbines is due to

Production of steam
Burning of coal
Burning of diesel
Flow of water

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
Weighing will depend on their masses
The silver piece will weigh more
The gold piece will weigh more

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