Crystal Structures MCQ Quiz – Objective Question with Answer for Crystal Structures


Crystal structure MCQ, Multiple Choice Questions on Crystal structure, Gate Questions on Crystal structure, Engineering MCQ, Crystal structure MCQ, Crystal structure Multiple Choice Questions. Multiple Choice Questions and Answers on the Crystal structure.

Topic Wise Crystal structure MCQs For ESE

1. The difference between the number of atoms in a unit cell of a BCC crystal and an FCC crystal is

  • (a) 1
  • (b) 2
  • (c) 4
  • (d) 6

Answer: (b) 2


Number of atoms in a unit cell of BCC crystal = 2

Number of atoms in a unit cell of FCC crystal = 4

Difference = 4 – 2 = 2

2. When BCC iron is heated, it changes to FCC iron resulting in

  • (a) contraction in volume
  • (b) increase in volume
  • (c) no change in volume
  • (d) crack in the material

Answer: (a) contraction in volume


in BCC iron, a\sqrt{3}=4r

in FCC iron, a\sqrt{2}=4r,

therefore, there is a contraction in volume when BCC iron changes to FCC iron.

3. In a silicon crystal, the arrangements of atoms are repeated periodically. This type of material is classified as

  • (a) Amorphous and non-crystalline
  • (b) Non-crystalline and epitaxial
  • (c) Epitaxial and single crystal
  • (d) Amorphous and single crystal

Answer: (c) Epitaxial and single crystal

Explanation: A single crystal material has a periodicity of atoms

4. Which one of the following statements is correct?

  • (a) hard and brittle
  • (b) soft and elastic
  • (c) hard and corrosive
  • (d) soft and inflammable

Answer: (a) hard and brittle

Explanation: Ionic crystals are hard and brittle because of strong ionic bonding.

5. Which one of the following exhibits the most well defined X-ray diffraction pattern?

  • (a) A polycrystalline aggregate
  • (b) An amorphous material
  • (c) A single crystalline material
  • (d) A plastically deformed crystal

Answer: (c) A single crystalline material

6. In a crystal lattice, what are the vacancies created by the absence of certain atoms known as?

  • (a) Hertz defects
  • (b) Schottky defects
  • (c) Pauli defects
  • (d) Crystal defects

Answer: (b) Schottky defects

7. Epitaxial lll-V group semiconductor compounds have which one of the following crystal structures?

  • (a) BCC
  • (b) FCC
  • (c) Hexagonal
  • (d) Zinc blends

Answer: (d) Zinc blends

8. In ionic crystal, electrical conductivity is

  • (a) Very high
  • (b) Depends on the material
  • (c) Depends on temperature
  • (d) Practically zero

Answer: (d) Practically zero

9. The crystal in which atoms are chemically highly inactive and they do not form compounds with other atoms is

  • (a) ionic crystal
  • (b) Metal
  • (c) Valance crystal
  • (d) Van der walls crystal

Answer: (d) Van der walls crystal

10. The unit cell of a certain type of crustal id is defined by three vectors \bar{a},\bar{b} \; and \;\bar{c} The vectors are mutually perpendicular but a\neq b\neq c. The crystal structure is

  • (a) Triclinic
  • (b) Tetragonal
  • (c) Orthorhombic
  • (c) Monoclinic

Answer: (c) Orthorhombic

11. The coordination number and the atomic packing factor for Hexagonal closed packed (HCP) and face-centered cubic crystal structure are respectively

  • (a) 8 and 0.74
  • (b) 12 and 0.68
  • (c) 8 and 0.68
  • (d) 12 and 0.74

Answer: (d) 12 and 0.74

12. The resistivity of material is a function of temperature because

  • (a) electrons density varies with temperature
  • (b) electron gas density varies with temperature
  • (c) the amplitude of vibration of an atom varies with temperature
  • (d) all of the above

Answer: (c) the amplitude of vibration of an atom varies with temperature

13. The atomic packing factor for dace centered cubic (FCC) crystal structure is

  • (a) 0.63
  • (b) 0.74
  • (c) 7.4
  • (d) 6.3

Answer: (b) 0.74

14. which on of the following helps experimental confirmation of the crystalline state of matter?

  • (a) Shock compression
  • (b) Photo emission
  • (c) Conductivity measurements
  • (d) X-ray diffraction

Answer: (c) Conductivity measurements

15. The ratio of ionic of cations i.e rc and that of Anions i.e. rA for stable and unstable ceramic crystal structure, is

  • (a) Less than unity
  • (b) Greater than unity
  • (c) Unity
  • (d) Either lesser or greater than unity

Answer: (a) Less than unity

16. The crystal structure of some ceramic materials may be thought of being composed electrically change cations and Anions, instead of Atoms, and as such:

  • (a) The cations are negatively charged because they have given up their valance electrons to Anions which are positively charged
  • (b) The cations are positively charged because they have given up their valence electrons to Anions which are negatively charged
  • (c) The cations are positively charged because they have added one electron to their valance electrons borrowing from Anions that are negatively charged
  • (d) The Cations are negatively charged as they are non-metallic whereas Anions are positively charged being metallic.

Answer: (b) The cations are positively charged because they have given up their valence electrons to Anions which are negatively charged

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