Physics
Radio activity is due to

Stable nucleus
Unstable nucleus
Stable electronic configu-ration
Stable electronic configu-ration

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Physics
Dynamo is a device for converting

Mechanical energy into electrical energy
Chemical energy into electrical energy
Magnetic energy into electrical energy
Heat energy into electrical energy

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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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