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 changes whereas its atomic number does not change
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

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Physics
Circuit breaker usually operate under

Steady state of short-circuit current
Sub-transient state of short-circuit current
After D. C. component has ceased
Transient state of short-circuit current

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