Physics
Copper wires are generally used for electrical power transmission instead of iron wire because :

Copper is a better conductor of electricity than iron
Copper is lighter than iron
Copper is cheaper than iron
Copper can take higher power than iron

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

Their velocity increases and they fall with different velocity on the earth
They fall with same ultimate velocity
They fall with that ultimate velocity, which are different for different droplets
Their velocity increases and they fall with same velocity on the earth

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