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- 1. Multiple Choice
The number of nearest particles which is in direct contact with a particle in a closed packed structure
Unit Cell
Void
Packing efficiency
Coordination number
- 2. Multiple Choice
Crystal system characterized by a ≠ b≠ c and α = β = γ = 90o
Hexagonal
Ortho rhombic
Tetragonal
Triclinic
- 3. Multiple Choice
In a primitive unit cell atoms are present at the
Corners & Centers of any 2 opposite sides
Corners only
Corners and Body Centre
Corners & Centers of all faces
- 4. Multiple Choice
There are ……….. Bravais lattices corresponding to 7 different Crystal Systems
8
9
14
13
- 5. Multiple Choice
The wrong statement about Para magnetism
They are weakly attracted by a magnetic field
They are magnetized in a magnetic field in the same direction
They keep their magnetism in the absence of magnetic field
It is due to the presence of one or more unpaired electrons
- 6. Multiple Choice
Crystal showing both Schottky & Frenkel defect
AgBr
ZnO
AgI
NaCl
- 7. Multiple Choice
Defect shown by ionic crystals with large difference in size
Schottky Defect
Impurity Defect
Frenkel Defect
Metal Deficiency Defect
- 8. Multiple Choice
Anionic sites occupied by unpaired electrons are called
F Centres
Interstitial Centres
Cationic Centres
Anionic Centres
- 9. Multiple Choice
An amorphous solid
CaCl2
NaCl
Glass
CsCl
- 10. Multiple Choice
Defect causing decrease in density
Schottky
Frenkel
F- centre
Metal Excess
- 11. Multiple Choice
Density of a crystal is given by the formula
- 12. Multiple Choice
AB AB … type close packing pattern represents
HCP
FCC
CCP
BCC
- 13. Multiple Choice
What type of material is this one?
Crystal
Amorphous
Covalent Crystal
Ionic Crystal
- 14. Multiple Choice
Is the most common crystal system for metals
Tetragonal
Trigonal
Monoclinic
Cubic
- 15. Multiple Choice
How many complete atoms can we find on the BCC (body centered cubic) structure?
1
2
3
4
- 16. Multiple Choice
Obtain the volume of the BCC crystal structure in term of it the atomic radius.
2R3
16R3√2
(4R/√3)3
(4R)3
- 17. Multiple Choice
Molybdenum (Mo) has a BCC crystal structure, an atomic radius of 0.1363 nm. Compute its theoretical volume.
3.1187x10-23 cm3
1.5594x10-23 cm3
3.1187x10-23 m3
1.5594x10-23 m3
- 18. Multiple Choice
Molybdenum (Mo) has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic
weight of 95.94 g/mol. Compute its theoretical density.
5.1083 g/cm3
10.2165 g/cm3
20.4331 g/cm3
10.2165 kg/m3
- 19. Multiple Choice
What is the coordination number in the FCC structure?
24
12
8
4
- 20. Multiple Choice
Which of the following statements about crystals is incorrect?
The shape of a crystal is dependent on the chemical conditions under which it formed
There are seven large groups of crystal geometries or crystal systems.
There are many geometric planes in a single crystal.
The atomic structure of a crystal defines it's geometric shape.
The shape of a crystal is independent of the physical conditions under which it formed.
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