Quiz  /  Solid State Class 12 MCQ Questions With Answers

  • 1. 
    An alloy of Cu, Ag and Au is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centre and gold is present at body centre, the alloy has a formula _______.

  • Cu4Ag2Au
  • Cu4Ag4Au
  • Cu4Ag3Au
  • CuAgAu

  • 2. 
    In both HCP and CCP the coordination number is

  • 12
  • 6
  • 4
  • 10

  • 3. 
    Frenkel defect is also known as

  • Metal Deficiency Defect
  • Impurity Defect
  • Metal Excess Defect
  • Dislocation Defect

  • 4. 
    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

  • 5. 
    The Crystal having highest melting point is

  • Ionic Crystal
  • Covalent Crystal
  • Molecular crystal
  • Metallic Crystal

  • 6. 
    Each of the following solids show, the Frenkel defect except

  • ZnS
  • AgBr
  • AgI
  • KCl

  • 7. 
    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

  • 8. 
    The percentage of empty space in a ccp arrangement is

  • 74
  • 26
  • 68
  • 52.4

  • 9. 
    Three elements A,B and C crystallise into a cubic solid lattice. Atom A occupy the corners,B occupy the cube centres and C occupy the edges. The formula of the compound is

  • ABC
  • ABC2
  • ABC3
  • ABC4

  • 10. 
    If NaCl is doped with 10–3 mol % of SrCl2, what is the concentration of cation vacancies?

  • 6.02 x 10 23
  • 6.02 x 10 20
  • 6.02 x 10 18
  • 6.02 x 10 19

  • 11. 
    A semiconductor material

  • Ga
  • As
  • Ge
  • Al

  • 12. 
    Which of the following point defects are shown by AgBr(s) Crystals?

  • Schottky and impurity
  • Frenkel and schottky
  • Frenkel and impurity
  • Non stoichiometric defect

  • 13. 
    How many unit cells are divided equally in a face-centred cubic lattice?

  • 2
  • 4
  • 6
  • 8

  • 14. 
    What is the Coordination numberof an atom in FCC or CCP structure ?

  • 4
  • 6
  • 8
  • 12

  • 15. 
    AB crystallizes in a body centred cubic lattice with edge length 'a' equal to 387 pm.The distance between two oppositely charged ions in the lattice is:

  • 200 pm
  • 300 pm
  • 335 pm
  • 250 pm

  • 16. 
    If the radius of the octahedral void is r and radius of the atoms in closepacking is R, What is the ratio between r and R.

  • 0.225
  • 0.414
  • 0.732
  • 0.889

  • 17. 
    For orthorhombic system axial ratios are a b c and the axial angles are:

  • α = β = γ ≠ 90
  • α ≠ β ≠ γ ≠ 90
  • α = β = γ = 90
  • α ≠ β ≠ γ = 90

  • 18. 
    A solid A+ B- has the B ions arranged IN BCC below. If the A+ ions occupy half of the octahedral sites in the structure. The formula of solid is _______.

  • AB
  • AB2
  • A2B
  • A3B4

  • 19. 
    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

  • 20. 
    Which defect causes decrease in the density of a crystal?

  • Interstitial
  • Frenkel
  • Schottky
  • F-Centre

  • 21. 
    Schottky defect in crystal is observed when

  • The ion leaves its normal position and occupies an interstitial location
  • unequal number of cation and anions are missing from the lattice
  • density of the crystal increases.
  • an equal number of cations and anions are missing from the lattice.

  • 22. 
    NaCl shows Schottky defects and AgCl Frenkel defects. Their electrical conductivity is due to _______.

  • motion of ions and not the motion of electrons
  • motion of electrons and not the motion of ions
  • lower coordination number of NaCl
  • higher coordination number of AgCl

  • 23. 
    The percentage of empty space in a face centre cubic arrangement is

  • 74
  • 52
  • 68
  • 26

  • 24. 
    Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

  • 0.607 nm
  • 0.407 nm
  • 6.07 nm
  • 4.07 nm

  • 25. 
    If Z is the number of atoms in the cell that represents the closest packing sequence ABCABC.......... the number of tetrahedral voids in the unit cell is

  • Z
  • 2Z
  • Z/2
  • Z/4

  • 26. 
    On doping Ge metal with a little of In(Indium) we get

  • n - type semiconductor
  • p-type semiconductor
  • insulator
  • rectifier
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