Free Printable PH8151 Crystal Physics

1.

What is a crystal?

a)

Its a solid substance with periodic arrangement of atoms

b)

its a liquid substance

c)

its a solid substance with random arrangement of atoms

d)

its a gas

2.

Define - Primitive Cell

a)

No lattice point

b)

having more then one lattice point

c)

Having multiple lattice point

d)

only one lattice point

3.

Define - unit cell

a)

smallest volume from which the entire crystal is built on by irregular repetition in 3 dimensions.

b)

volume from which the entire crystal is built on by reverse repetition in 3 dimensions.

c)

largest volume from which the entire crystal is built on by translational repetition in 3 dimensions.

d)

smallest volume from which the entire crystal is built on by translational repetition in 3 dimensions.

4.

The total number of crystal system is

a)

5

b)

8

c)

7

d)

4

5.

The number of possible crystal lattices is known as

a)

Space lattice

b)

Bravis Lattice

c)

Basis

d)

Lattice points

6.

An example of non- crystalline material

a)

Plastic

b)

Graphite

c)

Gold

d)

NaCl

e)

None of the above

7.

The crystal system having Lattice parameters a=b=c & α= β=γ = 90° is

a)

Hexagonal

b)

Orthorhombic

c)

Triclinic

d)

Simple Cubic

8.

The total number of possible Bravais Lattices are

a)

14

b)

15

c)

21

d)

10

9.

Amorphous solids have _______ structure.

a)

Dendritic

b)

Regular

c)

Irregular

d)

Linear

10.

what do you understand by term Lattice Parameters?

a)

three edges of unit cell

b)

three inter axial angles of unit cell

c)

three edges and inter-axial angles

d)

three Dimensional cube

11.

Smallest repeating unit of crystal lattice

a)

Lattice site

b)

Unit cell

c)

Crystal lattice

d)

Lattice point

12.

What is basis?

a)

a single atom attached to each lattice point

b)

a positive sign atoms attached to each lattice point

c)

a group of atoms attached to each lattice point

d)

a negative sign atoms attached to each lattice point

13.

What is the general form for indices of a plane ?

a)

mkl

b)

rkl

c)

hkl

d)

vkl

14.

Define - Lattice Constant

a)

the distance between the corner of neighboring atoms

b)

the distance between the centers of neighboring atoms

c)

the distance between the right side of neighboring atoms

d)

the distance between the left side of neighboring atoms

15.

Define - Atomic Radius

a)

r = a / 2

b)

r = a / 4

c)

r = 2 / a

d)

r = 2a

16.

Define - Packing Factor

a)

v/V

b)

v - V

c)

v + V

d)

v = V

17.

coordination number gives the information about the

a)

loosely packed atoms in a crystal.

b)

packing of atoms in a crystal.

c)

tightly atoms in a crystal.

d)

linely arranged atoms in a crystal.

18.

what is the percentage of emptiness in the Simple Cubic form?

a)

48%

b)

32%

c)

26%

d)

56%

19.

What is the percentage of emptiness in the Body Center Cubic form?

a)

70%

b)

50%

c)

32%

d)

63%

20.

What is the percentage of emptiness in the Face Centered Cubic form?

a)

43%

b)

29%

c)

15%

d)

26%

21.

Which of the given cubic structure has the highest packing factor

a)

FCC

b)

BCC

c)

SC

d)

none

22.

the sum of the sphere volumes of all atoms within a unit cell (assuming the atomic hard-sphere model) divided by the unit cell volume

a)

Atomic packing factor (APF)

b)

Total unit cell volume

c)

Volume of atoms in a unit cell

23.

when metals and nonmetals have more than one crystal structure

a)

Polymorphism

b)

Allotropy

24.

Which has a

a\ne b\ne c

Axial relationship?

a)

Orthorhombic

b)

Rhombohedral

c)

Tetragonal

d)

Cubic

25.

Which has an Interaxial Angles of

\alpha=\gamma=90\degree\ne\beta

?

a)

Monoclinic

b)

Triclinic

c)

Hexagonal

d)

None of this

26.

Which has an Interaxial Angles of

\alpha=\beta=90\degree,\gamma=120\degree

?

a)

Monoclinic

b)

Triclinic

c)

Hexagonal

d)

None of this

27.

Which has an Interaxial Angles of

\alpha=\beta=\gamma\ne90\degree

?

a)

Rhombohedral

b)

Triclinic

c)

Hexagonal

d)

Cubic

28.

This crystal system has angles that all meet at 90°, but none of the axes are the same length: a≠b≠c and α=β=γ= 90°

a)

Isometric

b)

Triclinic

c)

Hexagonal

d)

Orthorhombic

29.

In this crystal system, all of the axes are different lengths and two of the angles meet at 90°, one of them does not: a≠b≠c and α=γ= 90° β≠ 90°

a)

Orthorhombic

b)

Triclinic

c)

Monoclinic

d)

Isometric

30.

Give number of atom/s in BCC.

a)

0

b)

1

c)

2

d)

4

31.

State coordination number (CN) for FCC.

a)

4

b)

6

c)

8

d)

12

32.

State coordination number (CN) for HCP.

a)

4

b)

6

c)

8

d)

12

33.

Give number of atom/s in FCC.

a)

2

b)

4

c)

6

d)

8

34.

State coordination number (CN) for SC.

a)

4

b)

6

c)

8

d)

12

35.

Give number of atom/s in HCP.

a)

2

b)

4

c)

6

d)

8

36.

Atomic packing factor (APF) for SC.

a)

74%

b)

0.74

c)

0.68

d)

0.52

37.

Atomic packing factor (APF) for BCC.

a)

74%

b)

68%

c)

0.68

d)

0.52

38.

Atomic packing factor (APF) for FCC.

a)

74%

b)

52%

c)

0.68

d)

0.74

39.

State coordination number (CN) for BCC.

a)

4

b)

6

c)

8

d)

12

40.

Give number of atom/s in simple cubic (SC).

a)

0

b)

1

c)

2

d)

4

41.

Coordination number in simple cubic crystal structure

a)

8

b)

6

c)

12

d)

10

42.

-----------is defined as the no. Of nearest atoms which are directly surrounding given atom

a)

lattice

b)

Bravias

c)

Atomic packing factor

d)

Co-ordination no.

43.

A family of directions is represented by

a)

(hkl)

b)

<hkl >

c)

{hkl}

d)

[hkl]

44.

The number of Bravais lattices is:

a)

256

b)

7

c)

14

d)

37

45.

A cubic crystal system is represented by:

a)

a = b = c , α = β = γ ≠ 90°

b)

a = b ≠ c , α = β = γ = 90°

c)

a = b = c , α = β = γ = 90°

d)

a ≠ b ≠ c , α = β = γ = 90°

46.

Co-ordination no. & Atomic Packing Fraction of HCP structure is same as that of the -----------

a)

SC

b)

BCC

c)

FCC

d)

BCT

47.

The atomic diameter of an BCC crystal (if a is lattice parameter) is

a)

a

b)

a/2

c)

a/(4/√3)

d)

a/(4/√2)

48.

Which unit cell has eight particles located in the corners, has sides that are all the same length, and has angles of only 90?

a)

body-centered cubic unit cell

b)

triclinic unit cell

c)

face-centered cubic unit cell

d)

simple cubic unit cell

49.

Intercepts of a plane in crystal is given by 1, 1/2, 1/3 in a simple cubic unit cell, Miller indices are

a)

(1 3 2)

b)

(2 6 1)

c)

(1 2 3)

d)

(3 6 1)

50.

The correct order of the packing efficiency in different types of unit cells is _______?

a)

fcc < bcc < simple cubic

b)

fcc > bcc > simple cubic

c)

fcc < bcc > simple cubic

d)

bcc < fcc > simple cubic

51.

Atomic packing factor is

a)

Distance between two adjacent atoms

b)

Projected area fraction of atoms on a plane

c)

Volume fraction of atoms in cell

d)

None

52.

Atomic radius of BCC sturucture is

a)

$\sqrt{3}$ a/4

b)

$\sqrt{2}$ a/4

c)

4a/ $\sqrt{3}$

d)

a/2

53.

Packing density of BCC stucture is ----------(percentage)

a)

74

b)

32

c)

54

d)

68

54.

Atomic radius for FCC structure is

a)

a/2

b)

a√3/4

c)

a/4

d)

a√2/4

55.

Lead is a metallic crystal having a _______ structure

a)

SC

b)

FCC

c)

BCC

d)

HCP

56.

What is the atomic packing factor of FCC structure?

a)

0.74

b)

0.58

c)

0.96

d)

0.32

57.

Copper has FCC structure and its atomic radius is 1.273

A\degree

. Calculate its lattice parameter.

a)

0.360 $A\degree$

b)

0.63 $A\degree$

c)

3.60 $A\degree$

d)

3.06 $A\degree$

58.

Identify the given crystal structure.

a)

FCC

b)

HCP

c)

BCC

d)

SC

59.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

60.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

61.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

62.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

63.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

64.

A defect where atoms occupy the empty space between existing atoms within a crystal.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

65.

A defect where two or more crystals grow together on their faces.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

66.

A defect where single atoms are missing entirely from a crystal structure.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

67.

A type of crystal defect where single atoms are affected.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

68.

A defect where new atoms replace an existing atom within a crystal.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

69.

Regions in crystals where atoms are not perfectly aligned due to the presence of an extra partial plane of atoms.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

70.

Thermodynamically stable defects

a)

Point defects

b)

Line defects

c)

Surface defects

d)

Volume defects

71.

Burger’s vector changes with

a)

Kind of dislocation

b)

Length of dislocation

c)

Both kind and length of dislocation

d)

None

72.

Cations are present in the interstitial sites in __________.

a)

Frenkel defect

b)

Schottky defect

73.

Schottky defect is observed in crystals when __________.

a)

some cations move from their lattice site to interstitial sites.

b)

the equal number of cations and anions are missing from the lattice

74.

Which of the following is produced by a series of edge dislocation?

a)

tilt boundary

b)

grain boundary

c)

stacking fault

d)

twin boundary

75.

What is crystallography?

a)

Study of cells

b)

Study of earth

c)

Study of oceans

d)

Study of crystals

76.

Substitution of a foreign atom in the site of parent atom in the crystal is a________________?

a)

Vacancy defect

b)

Substitution impurity

c)

Volume imperfections

d)

Stacking Defect

77.

Vacancy defects in solids is a sub type of __________

a)

Point imperfections

b)

Line imperfections

c)

Volume imperfections

d)

Surface imperfections

78.

Edge dislocation imperfection is a sub type of _____________

a)

Point imperfections

b)

Line imperfections

c)

Volume imperfections

d)

Surface imperfections

79.

Displacement of an ion from regular location to interstitial location is known as ____________

a)

Vacancy defect

b)

Line imperfection

c)

Schottky’s defect

d)

Frenkel defect

80.

When a pair of cation and anion are missing in a crystal, it is called ____________.

a)

Vacancy defect

b)

Line imperfection

c)

Schottky’s defect

d)

Frenkel defect

81.

Twin or Twinning is a category of ________.

a)

Point imperfections

b)

Line imperfections

c)

Volume imperfections

d)

Surface imperfections

82.

Which one of the following is not a zero-dimensional defect?

a)

Vacancy defect

b)

Substitution imperfection

c)

Schottky’s defect

d)

Screw dislocation

83.

Carbon atoms are found in the spaces between iron atoms in steel. This crystal defect is a

a)

substitutional

b)

interstitial

c)

vacancy

d)

dislocation

84.

Crystals are solids made of

a)

light refracting particles

b)

regular repeating patterns of molecules

c)

hexagonal shaped super saturated molecules

d)

slow growing symmetrical solvents

85.

Which of the given cubic structure has the highest packing factor

a)

FCC

b)

BCC

c)

SC

d)

none

86.

Grain boundary is a

a)

point defect

b)

surface defect

c)

line defect

d)

none

87.

the basic structural unit or building block of the crystal structure and defines the crystal structure by virtue of its geometry and the atom positions within

a)

Lattice

b)

Amorphous

c)

Unit Cells

d)

FCC

88.

What is the small repeating entity of the atom structure?

a)

Crystal lattice

b)

Unit cell

c)

Crystal structure

d)

Shape

89.

Multiple unit cells stacked together in an infinite 3D array of points makes up what?

a)

Unit cell

b)

Molecular formula

c)

Crystal lattice

d)

Ionic bond

90.

This crystal system has angles that all meet at 90°, but one of the axes is not equal to the other 2: a=b≠c and α=β=γ= 90°

a)

Hexagonal

b)

Isometric

c)

Tetragonal

d)

Orthorhombic

91.

Example for crystalline solid

a)

Glass

b)

Quartz

c)

Plastic

d)

Rubber

92.

Crystalline solids are

a)

Isotropic

b)

Allotropic

c)

Anisotropic

d)

Isomorphic

93.

A unit assembly of atoms (or) molecules (ie., one or more atoms (or) molecules) identical in composition, arrangement and orientation is called

a)

Basis or Motif

b)

Lattice

c)

Crystal

d)

Non-crystalline

94.

In a cubic crystal, a given plane intercepts the axes at 3a, 3b & c. The Miller indices of the plane are ________

a)

( 3 3 1 )

b)

( 1 3 3 )

c)

( 1 1 3 )

d)

( 3 1 1 )

95.

In a crystal, a given plane is parallel to the 'a' axis and 'b' axis and intercepts the 'c' aces at c. The Miller indices of the plane are

a)

( 0 0 1 )

b)

( 1 1 0 )

c)

\left(\infty,\infty,1\right)

d)

( 1 1 1)

96.

The inter planar spacing between ( 1 2 2 ) planes found to be 2.35 Angstrom. The lattice constant in case of simple cubic is -------- Angstrom.

a)

0.261

b)

0.783

c)

7.05

d)

21.15

97.

The red shaded plane is:

a)

(100)

b)

(1,0,0)

c)

<100>

d)

{100}

98.

Identify the given plane.

a)

(011)

b)

(101)

c)

(001)

d)

(111)

99.

If a Miller index is zero, the plane is

a)

parallel to that axis

b)

perpendicular to axis

c)

equal to axis

d)

zero

100.

Interplanar distance of a family of planes with miller indices (hkl) is

a)

a=\frac{d}{\sqrt{h^2+k^2+l^2}}

b)

$d=\frac{a}{\sqrt{h^2+k^2+l^2}}$

c)

$d=a\sqrt{h^2+k^2+l^2\ }$

d)

$\sqrt{h^2+k^2+l^2}$

101.

------------- group of three numbers that indicates the orientation of a plane or set of parallel planes of atoms in a crystal

a)

Crystal structures

b)

Miller indices

c)

Bravais lattices

d)

Motif

PH8151 Crystal Physics

Total questions: 101

Worksheet time: 2hrs 41mins

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