Holography is a technique of?

(A) Recording a permanent, sharp two dimensional black and white or multi colour photograph.
(B) Recording a permanent three dimensional multi colour photograph.
(C) Recording a permanent three dimensional black and white photograph.
(D) Recording a permanent three dimensional photograph of a given single colour or a multi colour.

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  • A transformer work with?

    (A) Any signal
    (B) Both AC and DC
    (C) Direct current only
    (D) Alternating current only

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