Physics
If a band is played on the moon the sound will

Not be heard at any distance at all from it
Be heard upto 10km from it
Reverberate
Be heard by us faintly

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Physics
A dynamo is used to convert

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

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Physics
Hydro-electric power is a:

A mixture of renewable and non-renewable natural resource
non-renewable natural resource
Neither renewable nor non renewable resource
Renewable natural resource

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