Physics
The wall of a dam is broader at the base

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

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Physics
A drop of liquid assumes spherical shape because:

Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume

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