1. Which one of following is least symmetrical?

Tetragonal Simple cubic Triclinic Monoclinic

Hint Answer

2. The atomic packing fraction in a body centered cubic unit is cell is ____

0.74 0.52 0.68 0.66

Hint Answer

3. Which of following is a characteristic of crystalline structure?

High density Low density Range of melting point Short range of order

Differentiating Parameter	Structure
Crystalline Structure	Non-Crystalline Structure
Geometry	Well defined geometrical shape	Random shape
Melting point	Definite melting point	Rage of melting point
Density	High density when compared to non-crystalline structure due to strong primary atomic bonding.	Low density when compared to crystalline structure due to weak secondary atomic bonding
Range of order	Long range of order (periodicity)	Short range of order (periodicity)
XRD Diffraction pattern	Sharp diffraction pattern	Broad hump
Examples	Iron, Steel, HDPE, Quartz, etc.	Metallic glass, silica glass, LDPE, etc.

Hint Answer

4. Effective number of atoms in a face centered cubic (FCC) unit cell is equal to ____

4 1 8 2

Hint Answer

5. Which one of following is most symmetrical?

Simple cubic cell Hexagonal Triclinic Tetragonal

Hint Answer

6. Which of following axis system is being satisfied by rhombohedral (trigonal) crystal system?

a = b = c, α = β = γ = 90^o a ≠ b = c, α = β = γ = 90^o a = b ≠ c, α = β = γ = 90^o a = b = c, α = β = γ ≠ 90^o

Hint Answer

7. What is coordination number of body centered cubic unit cell?

4 6 8 2

Hint Answer

8. The atomic packing fraction in a face centered cubic unit is?

0.74 0.52 0.68 0.66

Hint Answer

9. Which of following is characteristic of non-crystalline structures?

Long range of periodicity Well defined structure and geometry Low density Sharp diffraction pattern

Hint Answer

10. Which of following axis system is being satisfied by monoclinic crystal system?

a = b = c, α = β = 90^o ≠ ϒ a ≠ b = c, α = β = ϒ = 90^o a ≠ b ≠ c, α = β = 90^o ≠ ϒ a = b = c, α ≠ β = ϒ = 90^o

Hint Answer

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Chapter:

Triclinic

0.74

High density

4

Simple cubic cell

a = b = c, α = β = γ ≠ 90o

8

0.74

Low density

a ≠ b ≠ c, α = β = 90o ≠ ϒ

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Crystallography and Defects in Solid

Which one of following is least symmetrical?

The atomic packing fraction in a body centered cubic unit is cell is ____

Which of following is a characteristic of crystalline structure?

Effective number of atoms in a face centered cubic (FCC) unit cell is equal to ____

Which one of following is most symmetrical?

Which of following axis system is being satisfied by rhombohedral (trigonal) crystal system?

What is coordination number of body centered cubic unit cell?

The atomic packing fraction in a face centered cubic unit is?

Which of following is characteristic of non-crystalline structures?

Which of following axis system is being satisfied by monoclinic crystal system?

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a = b = c, α = β = γ ≠ 90^o

a ≠ b ≠ c, α = β = 90^o ≠ ϒ