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

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
the pressure is the same as that outside.

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