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WorksheetsCrystal Structure - Unit 1
Total questions: 60
Worksheet time: 30mins
Name
Class
Date
1.
The crystalline solid state has __________________________
a)
Longrange positional and rotational order
b)
Short range positional and rotational order
c)
a much higher symmetry than the liqued state
d)
the higher possible symmerty consistant with a regular filling of space
2.
Which of the following has the least packing frachon ?
a)
Scc
b)
Bcc
c)
Fcc
d)
Diamond structure
3.
The volume of the primitive unit cell of fcc structure with lattice constant a is ____________
a)
aᶟ
b)
a ᶟ/2
c)
aᶟ/4
d)
aᶟ/8
4.
The ideal c/a ratio for the hexagonal close packed structure is ______________
a)
1
b)
√ 8/II
c)
√ 3
d)
√ 8/3
5.
The nearest neighbour distance in a bcc structure with lattice constant a is ____________
a)
a
b)
a √ 3/2
c)
a / √ 2
d)
√ 3 a/4
6.
The two dimensional lattice with the higher rotational symmentry is ___________
a)
square lattice
b)
hexagonal lattice
c)
honeycomb lattice
d)
triangular lattice
7.
The packing factor of diamond cubic crystal structure is ________
a)
0.6
b)
0.56
c)
0.9
d)
none
8.
A material having different properties in different direction in known as ____________
a)
amorphous
b)
copolymer
c)
anisotropic
d)
austenite
9.
The metal which has hexagonal close packed structure is ___________
a)
silver
b)
iron
c)
magnesium
d)
aluminium
10.
The number of nearest neighbours for a ______ lattice is _________
a)
Bcc , 8
b)
Fcc , 10
c)
HCP , 8
d)
FCC , 4
11.
The actual of the crystalline solids to determined by _____________
a)
X-rays
b)
Neutron beams
c)
Electron beams
d)
All the above
12.
Solids are classified in to _____________ types based on the arrangement of atoms.
a)
Three
b)
Two
c)
One
d)
Five
13.
___________________ materials have a regular and periodical arrangement of atoms
a)
Non crystalline
b)
Single crystal
c)
Crystalline
d)
Poly crystal
14.
______________ materials have very small crystals that are separated by well defined boundaries
a)
Non crystalline
b)
Single crystal
c)
Crystalline
d)
Poly crystal
15.
______________ materials have a irregular and non periods arrangement of atoms
a)
Non crystalline
b)
Single crystal
c)
Crystalline
d)
Poly crystal
16.
Amerphous solids are ______________
a)
Anisotropic
b)
Isotropic
c)
less stable
d)
Both b and c
17.
___________________ materials have sharp meeting point.
a)
Non crystalline
b)
Single crystal
c)
Crystalline
d)
Poly crystal
18.
The example for amorphous materials are _____________
a)
Glass
b)
Rubber
c)
Plastics
d)
All the above
19.
Which of the following is an example for crystalline materials ?
a)
Copper
b)
Aluminium
c)
Glass
d)
Both a and b
20.
In a large assemble of points, each point in a 3D lattice represents __________________
a)
Location of an atom
b)
Structure of an atom
c)
Space lattice
d)
Lattice
21.
Each point in the space lattice is called ________________
a)
Space points
b)
Lattice points
c)
Periodic points
d)
Translational points
22.
The line joining of the lattice points are called ____________
a)
Lattice lines
b)
Periodic lines
c)
Vector lines
d)
None of these
23.
A set of parallel and equally spaced planes in a space lattice is called _____________
a)
Lattice planes
b)
Lattice lines
c)
Lattice points
d)
Crystal planes
24.
Space lattice + __________= Crystal structure
a)
Atoms
b)
Basis
c)
Orientation
d)
Space points
25.
______________ is a fundamental elementary pattern having lowest number of atoms
a)
Unit cell
b)
Primitive
c)
Basis
d)
Space points
26.
_____________ is used to speafy all the characteristic of the crystal
a)
Primitive
b)
Unit cell
c)
Space points
d)
Basis
27.
_____________ determines the actual size of the unit cell
a)
Interfacial angles
b)
Primitives
c)
Both a and b
d)
Translational vectors
28.
Crystals are classified into _______________ crystal system
a)
Six
b)
Seven
c)
Five
d)
Four
29.
The example for tetragonal crystal system is ________________
a)
Tin
b)
Nacl
c)
Indium
d)
Both a and c
30.
In which crystal systems, the three axial lengths are of unequal
a)
Monoclinic
b)
Hexagonal
c)
Orthorhornbic
d)
Cubic
31.
In Hexagonal crystal system, two axes are equal in one plane at ______________ with each other
a)
90⁰
b)
180⁰
c)
45⁰
d)
120⁰
32.
In miller indices ,the integers are written with in the _______
a)
square bracket
b)
Parenthesis
c)
Square root
d)
Non of these
33.
Which of the following parameters characterise the unit cell ?
a)
No of atoms per unit cell
b)
Co ordination number
c)
Atomic radius
d)
All the above
34.
__________________ is the half of the distance between any two nearest neighbouring atoms
a)
atomic radius
b)
Co ordination number
c)
Vector lines
d)
None of these
35.
If the co ordination number is n is ____________
a)
tightly packed
b)
loosely packed
c)
stable
d)
unstable
36.
For a scc structure, the co ordination number is _____________________
a)
2
b)
4
c)
6
d)
8
37.
For a scc structure, the atomic radius is ___________
a)
a/2
b)
√3 /4a
c)
a/√2
d)
a/2√2
38.
For a scc structure, the APF is _______________
a)
42
b)
52
c)
74
d)
34
39.
For a scc structure, the number of atoms per unit cell is _________________________
a)
1
b)
6
c)
2
d)
3
40.
For a scc structure , the percentage of vacancies is ______________
a)
52
b)
48
c)
42
d)
58
41.
For a bcc structure, the co ordination number is _______________
a)
2
b)
4
c)
6
d)
8
42.
For a bcc structure, the atomic radius is _____________
a)
a/2
b)
√3 /4a
c)
a/√2
d)
a/2√2
43.
For a bcc structure, the APF is _____________________
a)
68
b)
52
c)
74
d)
34
44.
For a bcc structure, the number of atoms per unit cell is _____________________
a)
1
b)
6
c)
2
d)
3
45.
For a bcc structure, the percentage of vacancies is ______________
a)
32
b)
52
c)
48
d)
58
46.
For a fcc structure, the co ordination number is _________________
a)
4
b)
6
c)
8
d)
12
47.
For a fcc structure, the number of atoms per unit cell is __________________
a)
1
b)
2
c)
4
d)
6
48.
For a fcc structure, the atomic radius is _____________
a)
a/2
b)
√3 /4a
c)
a/√2
d)
a/2√2
49.
For a fcc structure, the APF IS _______________
a)
42
b)
52
c)
34
d)
74
50.
For a FCC structure, the percentage of vacancies is ______________
a)
26
b)
52
c)
48
d)
24
51.
For a HCP structure, the co ordination number is _______________
a)
4
b)
6
c)
8
d)
12
52.
For a HCP structure , the APF is ______________
a)
a/2
b)
a/2√2
c)
a/√2
d)
√3/4 a
53.
For a HCP structure, the APF is ______________
a)
74
b)
42
c)
52
d)
34
54.
For a HCP structure, the percentage of vacancies is _______________
a)
26
b)
52
c)
48
d)
24
55.
F or a HCP structure, the number of atoms per unit cell is _________________
a)
1
b)
2
c)
4
d)
6
56.
Which of the following is an example for SCC structure ?
a)
zinc
b)
chromium
c)
polonium
d)
copper
57.
Which of the following is an example for BCC structure ?
a)
zinc
b)
chromium
c)
polonium
d)
copper
58.
Which of the following is an example for FCC structure ?
a)
zinc
b)
chromium
c)
polonium
d)
copper
59.
Which of the following is an example for HCP structure ?
a)
zinc
b)
chromium
c)
polonium
d)
copper
60.
The co- ordination number for diamond is ______________
a)
2
b)
4
c)
6
d)
8
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