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

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

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases with depth
To withstand pressure that is increased with atmospheric pressure
Because streamlining is required
To withstand pressure that increases in a horizontal plane

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