Crystallography MCQs are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important Crystallography MCQs for Preparation.

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## Crystallography Online MCQs with Answers

Which of the following is the branch of science that deals with the study of crystals?
a) Crystallography
b) Mineralogy
c) Geology
d) Petrology

a) Crystallography

The repeating pattern of a crystal is called:
a) Crystal lattice
b) Crystal structure
c) Crystal habit
d) Crystal face

a) Crystal lattice

The smallest repeating unit in a crystal lattice is called:
a) Unit cell
b) Lattice point
c) Crystal system
d) Space group

a) Unit cell

How many crystal systems are there?
a) 3
b) 5
c) 7
d) 9

c) 7

Which crystal system has three axes of equal length that intersect at 90 degrees?
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

a) Cubic

Which crystal system has three axes of equal length that intersect at angles other than 90 degrees?
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

d) Hexagonal

Which crystal system has three axes of different lengths that intersect at 90 degrees?
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

c) Orthorhombic

The crystal system that has a four-fold rotational symmetry is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

b) Tetragonal

Which crystal system has a six-fold rotational symmetry?
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

d) Hexagonal

The crystal system that has a two-fold rotational symmetry is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

c) Orthorhombic

How many Bravais lattices are there?
a) 5
b) 7
c) 9
d) 14

d) 14

Which of the following is not a Bravais lattice?
a) Simple cubic
b) Body-centered cubic
c) Face-centered cubic
d) Hexagonal close-packed

d) Hexagonal close-packed

The crystal structure of sodium chloride (NaCl) is an example of:
a) Simple cubic lattice
b) Body-centered cubic lattice
c) Face-centered cubic lattice
d) Hexagonal close-packed lattice

c) Face-centered cubic lattice

The crystal structure of iron (Fe) is an example of:
a) Simple cubic lattice
b) Body-centered cubic lattice
c) Face-centered cubic lattice
d) Hexagonal close-packed lattice

b) Body-centered cubic lattice

The crystal structure of graphite is an example of:
a) Simple cubic lattice
b) Body-centered cubic lattice
c) Face-centered cubic lattice
d) Hexagonal close-packed lattice

d) Hexagonal close-packed lattice

Which of the following is an example of a non-crystalline or amorphous solid?
a) Diamond
b) Quartz
c) Glass
d) Ruby

c) Glass

The phenomenon of X-ray diffraction is used to study:
a) Crystal structures
b) Mineral compositions
c) Rock formations
d) Gemstone properties

a) Crystal structures

The Bragg’s Law relates the angles of incidence and diffraction to the:
a) Crystal lattice
b) Crystal structure
c) Crystal habit
d) Crystal face

a) Crystal lattice

In crystallography, the term “Miller indices” refers to:
a) A method of determining crystal symmetry
b) A system for describing crystal lattice directions and planes
c) A technique for measuring crystal density
d) A classification system for crystal habit

b) A system for describing crystal lattice directions and planes

The concept of “polymorphism” in crystallography refers to:
a) The ability of a crystal to exhibit different colors
b) The presence of impurities in a crystal lattice
c) The occurrence of multiple crystal structures for a given chemical compound
d) The formation of defects in a crystal structure

c) The occurrence of multiple crystal structures for a given chemical compound

The crystal system that has the highest symmetry is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Hexagonal

a) Cubic

The crystal system that has the lowest symmetry is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Triclinic

d) Triclinic

The crystal system that has a three-fold rotational symmetry is:
a) Cubic
b) Tetragonal
c) Trigonal
d) Hexagonal

c) Trigonal

The crystal system that has a five-fold rotational symmetry is:
a) Cubic
b) Tetragonal
c) Trigonal
d) Pentagonal

d) Pentagonal

The crystal system that has a mirror plane is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Monoclinic

d) Monoclinic

The crystal system that has a glide plane is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Rhombohedral

c) Orthorhombic

The crystal system that has a screw axis is:
a) Cubic
b) Tetragonal
c) Monoclinic
d) Triclinic

c) Monoclinic

The crystal system that has a center of symmetry is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Triclinic

a) Cubic

The crystal system that has a rotoinversion axis is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Rhombohedral

d) Rhombohedral

The crystal system that has no symmetry elements other than the identity operation is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Triclinic

d) Triclinic

The crystal system that has both a mirror plane and a glide plane is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Monoclinic

d) Monoclinic

The crystal system that has both a screw axis and a glide plane is:
a) Cubic
b) Tetragonal
c) Monoclinic
d) Triclinic

c) Monoclinic

The crystal system that has both a screw axis and a mirror plane is:
a) Cubic
b) Tetragonal
c) Monoclinic
d) Triclinic

c) Monoclinic

The crystal system that has both a center of symmetry and a rotoinversion axis is:
a) Cubic
b) Tetragonal
c) Orthorhombic
d) Rhombohedral

d) Rhombohedral

The concept of “stereographic projection” in crystallography is used to:
a) Represent crystal structures in two dimensions
b) Determine crystal density
c) Analyze crystal defects
d) Describe crystal growth patterns

a) Represent crystal structures in two dimensions

The concept of “twinning” in crystallography refers to:
a) The presence of impurities in a crystal lattice
b) The simultaneous occurrence of multiple crystal structures
c) The formation of defects in a crystal structure
d) The intergrowth of two or more crystal domains

d) The intergrowth of two or more crystal domains

The process of “reciprocal lattice” in crystallography is used to:
a) Analyze crystal defects
b) Calculate the diffraction pattern of a crystal
c) Determine crystal symmetry
d) Describe crystal habit

b) Calculate the diffraction pattern of a crystal

The term “zone axis” in crystallography refers to:
a) A line connecting two lattice points
b) A line connecting two atoms within a crystal
c) A direction within the crystal lattice
d) A plane within the crystal lattice

c) A direction within the crystal lattice

The concept of “packing fraction” in crystallography refers to:
a) The arrangement of atoms within a crystal lattice
b) The density of a crystal structure
c) The presence of impurities in a crystal lattice
d) The formation of crystal defects

b) The density of a crystal structure

The concept of “interplanar spacing” in crystallography refers to:
a) The distance between two crystal planes
b) The distance between two atoms within a crystal
c) The arrangement of atoms within a crystal lattice
d) The presence of impurities in a crystal lattice

a) The distance between two crystal planes

The concept of “reciprocal space” in crystallography is used to:
a) Describe crystal growth patterns
b) Analyze crystal defects
c) Calculate the diffraction pattern of a crystal
d) Determine crystal habit

c) Calculate the diffraction pattern of a crystal

The crystallographic technique used to determine the atomic arrangement in a crystal is called:
a) X-ray diffraction
b) Scanning electron microscopy
c) Transmission electron microscopy
d) Atomic force microscopy

a) X-ray diffraction

The crystallographic technique used to study the surface of a crystal is called:
a) X-ray diffraction
b) Scanning electron microscopy
c) Transmission electron microscopy
d) Atomic force microscopy

b) Scanning electron microscopy

The crystallographic technique used to study the internal structure of a crystal is called:
a) X-ray diffraction
b) Scanning electron microscopy
c) Transmission electron microscopy
d) Atomic force microscopy

c) Transmission electron microscopy

The crystallographic technique used to study the topography and properties of a crystal surface is called:
a) X-ray diffraction
b) Scanning electron microscopy
c) Transmission electron microscopy
d) Atomic force microscopy

d) Atomic force microscopy

The term “Burgers vector” in crystallography refers to:
a) The magnitude and direction of a crystal lattice vector
b) The density of a crystal structure
c) The presence of impurities in a crystal lattice
d) The formation of crystal defects

a) The magnitude and direction of a crystal lattice vector

The term “dislocation” in crystallography refers to:
a) The arrangement of atoms within a crystal lattice
b) The density of a crystal structure
c) The presence of impurities in a crystal lattice
d) The formation of crystal defects

d) The formation of crystal defects

The term “twin boundary” in crystallography refers to:
a) A line connecting two lattice points
b) A line connecting two atoms within a crystal
c) A boundary between two crystal domains
d) A plane within the crystal lattice

c) A boundary between two crystal domains

The term “morphology” in crystallography refers to:
a) The arrangement of atoms within a crystal lattice
b) The external shape and form of a crystal
c) The presence of impurities in a crystal lattice
d) The formation of crystal defects