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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Physics
A dynamo is used to convert

Mechanical energy into electrical energy
Electrical energy into mechanical energy
Electrical energy into magnetic energy
Magnetic energy into mechanical energy

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