Physics
Hydro-electric power is a:

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

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Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with loss of intensity

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