Physics
The colour of sky appears blue due to

Dispersion
Refraction
Scattering of shorter wave lengths
Reflection

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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 liquid surface falls down only at the center of the tank
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

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Physics
Absolute Zero is defined as

At which water boils at 298K
The temperature at which all molecular motion ceases
At which liquid Helium boils
At which the volume becomes zero

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