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
A white and smooth surface is

Good absorber and good reflector of heat
Bad absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat

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