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

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

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
None of these

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