Physics
Circuit breaker usually operate under

Transient state of short-circuit current
Steady state of short-circuit current
Sub-transient state of short-circuit current
After D. C. component has ceased

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Physics
Holography is a technique of

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

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