Physics
The earth-wire of a cable is connected to

The fuse of the appliance
The outer metallic body of the appliance
The filament of the appliance
Short circuitry of the appliance

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Physics
Inside an aeroplane, flying at a high altitude,

normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.

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Physics
In a conductor

The valence band and the conduction band overlap each other
The forbidden energy gap is very narrow
There is no conduction band
The forbidden energy gap is very wide

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