Physics
Absolute Zero is defined as

At which the volume becomes zero
The temperature at which all molecular motion ceases
At which water boils at 298K
At which liquid Helium boils

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Physics
In the gamma decay of a nucleus

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

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