Physics
Which of the following is arranged in order of decreasing conductivity?

Silver, Copper, Aluminium, Steel
Copper, Aluminium, Steel, Silver
Copper, Silver, Aluminium, Steel
Aluminium, Silver, Copper, Steel

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Physics
Mirage is due to:

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

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