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Quantitative Aptitude

Solid Geometry

Which one of ...

Question

Which one of the following schemes of ordering closed packed sheets of equal sized spheres do not generate close packed lattice?

A

A B C A B C

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B

A B A C A B A C

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C

A B B A A B B A

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D

A B C B C A B C B C

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Solution

The correct option is A $A B B A A B B A$
The scheme ABBAABBA of ordering closed packed sheets of equal sized spheres does not generate close packed lattice. Hexagonal close packing (ABAB type) generates close packed lattice in which 74% lattice is occupied.

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