Physics
Which one is the unit of surface tension of a liquid

None of these
Electron volt /cm2
Joule/ mm
Newton /m2

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Physics
In the gamma decay of a nucleus

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

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