Physics
An optically plane surface reflects a beam of light

As a diffused beam in one direction
As diffused beams in all directions
As parallel beams in all directions
As a parallel beam in one direction

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

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

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