Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.

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Physics
Negative feedback in amplifiers

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

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The liquid surface falls down on the direction of motion and rises up on the back side of the tank
None
The surface of the liquid remains horizontal
The liquid surface falls down only at the center of the tank

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