Physics
Blowing Air with open pipe is an example of :

Isobaric process
Adiabatic process
Isochroric process
Isothermal process

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.

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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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