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 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

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.
sand is soft and concreter is hard.

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