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
Hydro-electric power is a:

Renewable natural resource
Neither renewable nor non renewable resource
non-renewable natural resource
A mixture of renewable and non-renewable natural resource

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

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
It produces corrosion

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