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
None
The surface of the liquid remains horizontal

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a lower density than metals
plastics have a higher thermal conductivity than metals
metals have higher thermal capacity than plastics
metals are good conductor of heat

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