Crystallography

Pick an option to see whether it holds. If one of them stops you, the theory page is two steps back.

1. 01

   Packing density of BCC structure is:

   • a) π/6
   • b) √3 π/8
   • c) √2 π/6
   • d) 8/√3 π
2. 02

   The number of diad axes of symmetry elements that are present in a cubic crystal are:

   • a) 4
   • b) 6
   • c) 8
   • d) 10
3. 03

   The atomic radius of FCC is:

   • a) √3 a/4
   • b) √2 a/4
   • c) a/2
   • d) a/4
4. 04

   The number of atoms in a primitive cell is:

   • a) 1
   • b) 1/3
   • c) 3
   • d) 3/2
5. 05

   Void space =

   • a) (1 + APF) × 100
   • b) (1 − APF) × 100
   • c) (1 + APF)/100
   • d) (1 − APF)/100
6. 06

   The relation of length of axes of unit cell in monoclinic system is:

   • a) a = b = c
   • b) a ≠ b ≠ c
   • c) a = b ≠ c
   • d) a ≠ b = c
7. 07

   In tetrad axis of symmetry, after every ____ rotation, the crystal goes into its congruent position.

   • a) 90°
   • b) 180°
   • c) 270°
   • d) 360°
8. 08

   Classify the following unit cell into the proper system: a = 1.08 nm, b = 0.947 nm, c = 0.52 nm, α = 41°, β = 82°, γ = 95°

   • a) Triclinic
   • b) Monoclinic
   • c) Cubic
   • d) Orthorhombic
9. 09

   The atomic radius for a Simple Cubic (SC) lattice is:

   • a) √3 a/4
   • b) √2 a/4
   • c) a/2
   • d) a/4
10. 10

    Total number of planes of symmetry for cubic structure is:

    • a) 3
    • b) 23
    • c) 12
    • d) 9
11. 11

    Coordination number for BCC structure is:

    • a) 6
    • b) 8
    • c) 12
    • d) 2
12. 12

    Void space for FCC structure is:

    • a) 26 %
    • b) 32 %
    • c) 48 %
    • d) 76 %
13. 13

    The tiny fundamental block which, when repeated in space indefinitely, generates a crystal is called:

    • a) Primitive cell
    • b) Lattice cell
    • c) Unit cell
    • d) Basis cell
14. 14

    The nearest neighbour distance in the case of BCC structure is:

    • a) a/√2
    • b) a
    • c) √3 a/2
    • d) √3 a/4
15. 15

    The length of axes in the orthorhombic crystal system is:

    • a) a = b = c
    • b) a ≠ b ≠ c
    • c) a = b ≠ c
    • d) a ≠ b = c
16. 16

    Atomic packing factor for FCC structure is:

    • a) 0.68
    • b) 0.74
    • c) 0.52
    • d) 1.00
17. 17

    Total triad axes of symmetry for cubic structure is:

    • a) 1
    • b) 3
    • c) 4
    • d) 6
18. 18

    The Bravais lattices for cubic structure are:

    • a) Simple, base and body centred
    • b) Simple, face and base centred
    • c) Simple, body and face centred
    • d) Base, body and face centred
19. 19

    The total symmetry elements in cubic structure of crystal are:

    • a) 13
    • b) 23
    • c) 3
    • d) 1
20. 20

    The packing density of the BCC structure is:

    • a) 52 %
    • b) 68 %
    • c) 92 %
    • d) None of these
21. 21

    What is the ratio of atomic radius r and lattice parameter a of a BCC system?

    • a) 2
    • b) 1/2
    • c) 1/2√2
    • d) √3/4
22. 22

    The total axes of symmetry in cubic structure are:

    • a) 9
    • b) 1
    • c) 13
    • d) 14
23. 23

    The tetragonal crystal system has the Bravais lattices:

    • a) Simple
    • b) Simple and base centred
    • c) Simple and body centred
    • d) Simple and face centred
24. 24

    The number of lattice points in a primitive cell are:

    • a) 1
    • b) 1/2
    • c) 2
    • d) 3/2
25. 25

    The relation of length of axes of unit cell in the monoclinic crystal system is:

    • a) a = b = c
    • b) a = b ≠ c
    • c) a ≠ b ≠ c
    • d) a ≠ b = c