Physics
Super conductors are substances that

Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current
Conduct electricity at low temperature
Conduct electricity at high temperature

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Physics
Holography is a technique of

Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional black and white photograph
Recording a permanent, sharp two diimensional black and white or multicolour photograph

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