Physics
Negative feedback in amplifiers

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

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is-deeper than the river
The sea is wider than the river

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