Physics
Two stones of different masses are dropped simultaneously from the top of a building

Smaller stone reaches the ground earlier
Both the stones reach the ground at the same time
Depends on the composition of the stone
Larger stone reaches the ground earlier

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Physics
Holography is a technique of

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

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