Close-packed crystal structures of elements - Classification and Structure of Materials - Engineering Sciences Previous Year Questions

1

2007 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2007

The Mo-Mo nearest neighbour distance (in nm) is

A

0.223

B

0.273

C

0.136

D

0.1575

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2

2008 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2008

The stacking sequence of the (001) FCC and (0001) HCP planes is

A

...ABAB and ABAB...

B

...ABCABC and ABCABC...

C

...ABAB and ABCABC...

D

...ABCABC and ABAB...

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3

2009 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2009

Equal size spherical balls when packed together will yield maximum theoretical packing of

A

~ 52 %

B

~ 68 %

C

~ 74 %

D

~ 86 %

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4

2009 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2009

The Ni – Ni nearest neighbour distance (in nm) is

A

0.173

B

0.223

C

0.250

D

0.273

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5

2009 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2009

Theoretical density of Nickel (in kg m⁻³) is closer to

A

8700

B

8900

C

9100

D

9300

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6

2011 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2011

Which one of the following pairs of crystal structures can have the same packing fraction of 0.74?

A

FCC and BCC

B

HCP and BCC

C

FCC and HCP

D

BCC and BCT

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7

2013 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2013

The number of slip systems in a metal with FCC crystal structures is

A

4

B

6

C

8

D

12

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8

2015 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2015

Calculate the planar density of the (100) plane in an fcc crystal given that R is the atomic radius of the element.

A

0.25 R²

B

0.25/R²

C

1/R²

D

4/R²

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9

2015 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2015

Calculate the density of copper in kg m^-3 given that copper has an fcc lattice with a lattice parameter of 0.365 nm. Copper has an atomic weight of 63.54 amu.

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10

2017 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2017

The number of close packed planes in the lattice of an FCC metal is

A

2

B

4

C

6

D

12

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11

2026 · Engineering Sciences · Classification and Structure of Materials · Close-packed crystal structures of elements

Engineering Sciences (XE) 2026

Consider 3 crystals (all having FCC lattice) labelled as P, Q and R as described below:
Crystal P: Cu crystal with 4 Cu atoms per unit cell
Crystal Q: NaCl crystal with 4 Na⁺ ions and 4 Cl⁻ ions per unit cell
Crystal R: Diamond crystal with 8 C atoms per unit cell
Which of the following options is/are correct?

A

Only crystal P is a close packed structure.

B

Only crystal Q is a close packed structure.

C

Crystal R has the smallest packing factor.

D

All the crystals P, Q and R are close packed structures.

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