Physics
The snow on the mountains does not melt all at once when it is heated by the sun because:

It has a high latent heat of fusion
It becomes very hard
It reflects most of the heat from the sun
It has a low specific heat capacity

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Physics
The velocity of sound in air

Decreases with increase of temperature
Does not depend on temperature
Increases with decrease of temperature
Decreases with decrease of temperature

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

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