Physics
Ventilators are provided near the ceiling of the room because

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

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Physics
A Fuse wire is characterised by

Low resistance and high melting point
Low resistance and low melting point
High resistance and low melting point
High resistance and high melting point

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