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A3. The ratio of packing efficiency in scc, bcc and fcc crystalline structures is (a) 1 : 1.2 : 1.3 (b) 1 : 1.12 : 1.23 (c) 1 : 1.3 : 1.4 (d) 1 : 1.25 : 1.38 11

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Q1

The correct order of the packing efficiency in different types of nuit cells is ............

(a) fcc < bcc < simple cubic (b) fcc > bcc > simple cubic

(c) fcc < bcc > simple cubic (d) fcc < bcc > simple cubic

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Q2

Statement 1: Distance between nearest lattice points in BCC is greater than the same in FCC having same edge length.
Statement 2: FCC has greater packing efficiency than BCC.

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Q3

The ratio of packing density in fcc, bcc and cubic structure is respectively_________.

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Q4

13. In fcc packing,tetrahedral voids divide a body diagonal in the ratio of A)1:1:1 B)1:2:2 C)1:2:1 D)1:2:3

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Q5

Assertion :Distance between nearest neighbour in bcc is greater than that of fcc having same edge length. Reason: Fcc had greater packing efficiency than bcc.

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