Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
It produces corrosion

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Physics
Mirage is due to:

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

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