Physics
Flywheel is an important part of a steam engine because it :

Decreases the moment of inertia
Gives strength to the engine
Helps the engine in keeping the speed uniform
Accelerates the speed of the engine

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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
What is refractive index ?

None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the product of speed of light in medium and in vacuum.

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