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- 1. Multiple Choice
The number of atoms per unit cell in simple, fcc and bcc unit cells are
1, 4, 2
1, 2, 4
2, 1, 4
2, 4, 1
- 2. Multiple Choice
In 3D close packing the ABCABCABC.....pattern gives rise to which type of close packing?
Hexagonal Close Packing (hcp)
Cubic Close Packing (ccp)
Face Centred Cubic Packing (fcc)
Both ccp and fcc
- 3. Multiple Choice
The packing efficiency in simple, fcc, bcc unit cells will be respectively
74% 52.4% 68%
52.4% 68% 74%
68% 74% 52.4%
52.4% 74% 68%
- 4. Multiple Choice
The relationship between the atomic radius (r) and edge length (a) of a simple, fcc, bcc cubic unit cell will be respectively
- 5. Multiple Choice
The coordination number in simple, fcc, bcc close packing arrangement will be respectively
1, 4, 2
6, 12, 8
4, 6, 8
none of the above
- 6. Multiple Choice
The total number of tetrahedral voids and octahedral voids in a given cubic unit cell with N number of atoms will be respectively
2N and N
N and 2N
4N and N
N and 4N
- 7. Multiple Choice
What type of material is this one?
Crystal
Amorphous
Covalent Crystal
Ionic Crystal
- 8. Multiple Choice
What is the coordination number in the FCC structure?
24
12
8
4
- 9. Multiple Choice
In METAL EXCESS DEFECTS the sites where an electron gets trapped in the anionic vacancy disturbing the ratio of cation to anion is known as
E- CENTRE
F- CENTRE
G- CENTRE
I- CENTRE
- 10. Multiple Choice
Which of the following is not a characteristic of a crystalline solid?
Definite and characteristic heat of fusion.
Long range order or perfect arrangement of constituent particles
Isotropic in nature
clean cleavage or smooth edges on cutting with a knife
- 11. Multiple Choice
Which of the following is an amorphous solid?
Copper(Cu)
Quartz glass (SiO2)
Silicon carbide (SiC)
Sodium Chloride (NaCl)
- 12. Multiple Choice
Which of the following is a network solid or covalent crystalline solid?
Diamond (C)
H2O (Ice)
Calcium Fluoride (CaF2)
Iron Metal (Fe)
- 13. Multiple Choice
The type of crystalline solid which is a good conductor in solid as well as molten state?
Ionic Solid
Metallic Solid
Covalent Solid
Molecular Solid
- 14. Multiple Choice
What is the smallest repetitive unit of the crystal / lattice structure known as?
Atom
Molecule
Lattice Point
Unit Cell
- 15. Multiple Choice
The total number of tetrahedral voids and octahedral voids per unit cell of face-centred cell (fcc) are
8, 4
4, 8
2, 4
4, 2
- 16. Multiple ChoiceThe crystal structure of sodium chloride isBCCFCCamorphouscovalent
- 17. Multiple Choice
A. Ionic solids are hard and brittle.
B. Covalent solids are good conductors.
A and B are correct.
A is correct
B is correct
Both A and B are wrong
- 18. Multiple Choice
Percentage of free space in a body centered cubic unit cell is
32%
34%
28%
20%
- 19. Multiple Choice
In both HCP and CCP the coordination number is
12
6
4
10
- 20. Multiple Choice
Which of the following is a network solid?
SO2(Solid)
I2(Solid)
Diamond
H2O(Ice)
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