Physics
A spherical ball made of steel when dropped in mercury container

Sink in mercury
Will be partly immersed mercury
Will dissolve in mercury
Will be on the surface of mercury

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

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

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Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
It cooks the food at low pressure
Boiling point decreases with rise of pressure
The material of the cooker is a good conductor

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