Physics
The layer of atmosphere used for radio-wave transmission is

Stratosphere
Chromosphere
Ionosphere
Troposphere

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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?

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
The liquid surface falls down only at the center of the tank
None

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