Physics
Which elements are malleable and good conductors of electricity?

Iodine and silver
Iodine and xenon
Tin and silver
Tin and xenon

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Physics
Light houses are places with powerful lights to :

Guide and resolve traffic jams in crowded metro-cities 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 help large crowds at religious gathering during nights

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Physics
The law of conservation of energy states that

Energy can either be created or destroyed
Energy can either be created nor destroyed
Energy can neither be created or destroyed
Energy can neither be created nor destroyed

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