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?

None
The surface of the liquid remains horizontal
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

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

None of these
The material of which pipes are made contracts due to cold and so breaks
Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break

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