Physics
Ventilators are provided near the ceiling of the room because

These do not look nice in the lower part
The exhaled warmer air rises up and goes out
These provide some sunlight in the room
These provide cross ventilation in the room

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Physics
Hydro-electric power is a:

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

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