Physics
In a conductor

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

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Physics
Light houses are places with powerful lights to :

Guide and help large crowds at religious gathering during nights
Guide and warn the ships coming from different directions in the ocean
Indicate to the incoming warships, the location of a harbour during night
Guide and resolve traffic jams in crowded metro-cities during nights

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Physics
Should cars have bumpers that collapse under impact?

No, since the colliding car would then ram into the occupants and kill them
No, since it would be very expensive to get the car repaired
Yes, since the offending car should get damaged and pay for the mistake
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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