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

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

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Physics
Negative feedback in amplifiers

Decreases bandwidth and increases noise
Increases bandwidth and decreases noise
Increases bandwidth and increases noise
Decreases bandwidth and decreases noise

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in rolling a stone is less than in lifting it.
Work done in lifting the stone is equal to rolling it.
Work done in rolling is more than in lifting.
Work done in both is same but the rate of doing work is less in rolling.

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