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

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Physics
In a conductor

The forbidden energy gap is very narrow
The forbidden energy gap is very wide
The valence band and the conduction band overlap each other
There is no conduction band

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