Physics
Solids which conduct electricity at higher temperature but not at lower temperature are called

Super-conductor
Metallic-conductor
Semi-conductor
Insulator

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Physics
In a conductor

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

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

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