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
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy
Absence of gravity outside
Presence of gravity outside but not inside the spacecraft

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Physics
Super conductors are substances that

Conduct electricity at high temperature
Offer high resistance to the flow of electric current
Conduct electricity at low temperature
Offer minimum resistance to flow of electric current

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