Physics
Intensity of any wave is proportional to which of the following?

Cube of amplitude
Square root of amplitude
Amplitude
Square of amplitude

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Physics
Negative feedback in amplifiers

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

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

coal tar is a liquid and it flows in the barrel when it is rolled
the rolling friction is much less than the sliding friction
more surface area of the barrel is in contact with the road when it is pulled
the full weight of the barrel comes into play when it is pulled

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