Physics
Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be

At the same level in both
At a higher level in alcohol
Floating in alcohol and sinking in water
At a higher level in water

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Physics
RADAR is used for:

locating submerged submarines.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.
locating geostationary satellites.

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