WorksheetsCrystal structure
Total questions: 20
Worksheet time: 34mins
The correct order of the packing efficiency in different types of unit cells is _______?
fcc < bcc < simple cubic
fcc > bcc > simple cubic
fcc < bcc > simple cubic
bcc < fcc > simple cubic
Which of the following statements about lattices and unit cells is correct?
A unit cell contains a whole number of complete molecules
Lattice points are chosen to lie on atoms.
Lattice points all have identical surroundings
Unit cells are constructed by connecting adjacent lattice points to give the largest possible repeat unit.
Consider the Bragg equation. If the value of the wavelength is doubled, which of the following is NOT true?
Bragg angles of reflections increase.
The d spacings become smaller.
The diffraction pattern expands.
Some previously accessible reflections can no longer be measured.
Repeatable entity of a crystal structure is known as
Crystal
Lattice
Unit cell
Miller indices
Coordination number for closest packed crystal structure
16
12
8
4
Atomic packing factor is
Distance between two adjacent atoms
Projected area fraction of atoms on a plane
Volume fraction of atoms in cell
None
Coordination number in simple cubic crystal structure
8
6
12
10
A family of directions is represented by
(hkl)
<hkl >
{hkl}
[hkl]
-----------is defined as the no. Of nearest atoms which are directly surrounding given atom
lattice
Bravias
Atomic packing factor
Co-ordination no.
The number of Bravais lattices is:
256
7
14
37
A cubic crystal system is represented by:
a = b = c , α = β = γ ≠ 90°
a = b ≠ c , α = β = γ = 90°
a = b = c , α = β = γ = 90°
a ≠ b ≠ c , α = β = γ = 90°
Co-ordination no. & Atomic Packing Fraction of HCP structure is same as that of the -----------
SC
BCC
FCC
BCT
The atomic diameter of an BCC crystal (if a is lattice parameter) is
a
a/2
a/(4/√3)
a/(4/√2)
The plane (1⎯11) is parallel to
(⎯11⎯1)
(⎯1⎯11)
(111)
(1⎯11)
The angle between [111] and [11⎯2] directions in a cubic crystal is (in degrees)
0
45
90
180
Which unit cell has eight particles located in the corners, has sides that are all the same length, and has angles of only 90?
body-centered cubic unit cell
triclinic unit cell
face-centered cubic unit cell
simple cubic unit cell
A particular metal has a simple cubic unit cell. How many atoms of the metal are in each unit cell?
1
2
6
2
Number lattice points in an unit cell is
one
two
four
depends on type of Bravais lattice
Intercepts of a plane in crystal is given by 1, 1/2, 1/3 in a simple cubic unit cell, Miller indices are
(1 3 2)
(2 6 1)
(1 2 3)
(3 6 1)
What is the common direction between the (132) and (133) planes?
[3 1 0]
[3 10]
[4 1 0]
[0 1 4]
