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
Solar eclipse will take place when

the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth

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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at low temperature
conduct electricity at high temperatures
offer no resistance to the flow of electricity

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