Physics
For an ideal gas, which one of the following statements does not hold true?

There is no interactive force between the molecules.
The potential energy of the gas molecules is zero
The speed of all gas molecules is same
The kinetic energies of all gas molecules are not same

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Physics
Which is evidence that supports the dynamo theory?

Earth's core contains a large amount of iron
Convection occurs in Earth's inner core
Granite and basalt conduct electricity
Earth's outer core contains liquid that conducts electricity

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