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

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

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Physics
Mirage is due to:

Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere

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