Physics
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Nail exerts more pressure than needle on the balloon.
Gas is reactive with the needle.
Needle exerts more pressure than nail on the balloon.
Nail is more longer than needle.

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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?

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
The liquid surface falls down only at the center of the tank

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