Physics
The wall of a dam is broader at the base

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

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Physics
The Hooke's law is valid for

Only proportional region of the stress strain curve
Entire stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire elastic region of the stress strain curve

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