Physics
For which of the following substances, the resistance decreases with increase in temperature?

Copper
Nichrome
Pure silicon
Platinum

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

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

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The metal ball suffers greater change in momentum
The rubber ball suffers greater change in momentum
Both suffer the same change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball

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