Physics
A dynamo is a device which

Converts mechanical energy into electrical energy
Creates mechanical energy
Creates electrical energy
Converts electrical energy into mechanical energy

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Physics
Which of the following is not a property of heavy water ?

Density of heavy water is higher than that of ordinary water
It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water

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