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
To withstand pressure that increases in a horizontal plane
Because streamlining is required

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus does not change whereas its atomic number changes
The mass number of the nucleus changes whereas its atomic number does not change
Both the mass number and the atomic number of the nucleus change
Neither the mass number nor the atomic number of the nucleus changes

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