Physics
When a steel ball is placed on the surface of mercury, it does not sink because

Of the surface tension of mercury
Of the high viscosity of mercury
Mercury is a semisolid
The density of mercury is greater than that of steel

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Physics
Mirage is due to:

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

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