Physics
What is the reason for twinkling of stars ?

Dispersion of light
Atmospheric refraction
Atmospheric reflection
Total internal reflection

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

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

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