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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Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can neither be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created or destroyed

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Physics
Super conductors are substances that

Conduct electricity at low temperature
Conduct electricity at high temperature
Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current

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