The Solid State MCQ

The Solid State

Multiple Choice Questions

  

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1. Which of the following statement is false for the Solid state.
   1.   They are incompressible
   2.   They are rigid
   3.   They have definite shape and mass.
   4.   They have indefinite volume
2. Which of the following statement is false for crystalline solids.
   1.   They have sharp melting point.
   2.   They have definite enthalpy of fusion.
   3.   They are isotropic.
   4.   They have long range order.
3. The number of atoms in bcc and fcc arrangements are respectively:
   1.   1,2
   2.   4,2
   3.   2,4
   4.   2,1
4. If edge of a fcc crystal of an element is a cm, M is the atomic mass and N₀ is the Avogadro number, then density of crystal is:
   1.   4M/a³N₀
   2.   2M/a³N₀
   3.   4N₀/Ma³
   4.   Ma³/2N₀
5. Which of the following statement is not true about crystalline solids?
   
   
   1.   Polar molecular solids have higher enthalpies of vaporization than those of non-polar molecular solids.
   2.   Graphite, though covalent solid is a good conductor of electricity.
   3.   Ionic solids are conductor in molten state.
   4.   Non-polar molecular solids have London forces between the constituents and have higher melting points than polar molecular solids.
6. In which of the following pairs, both the crystals are not of the same type.
   1.   Ice, Solid CO2.
   2.   Mg, Ar
   3.   NaCl, BaO
   4.   SiC, Diamond
7. The co-ordination number in ccp and hcp arrangement of metal atoms are respectively
   1.   12, 12
   2.   6, 6
   3.   12, 6
   4.   8, 6
8. If the alignment of magnetic moment in a substance is in a compensatory way so as to give zero net magnetic moment, then the substances is said to be
   1.   Ferromagnetic
   2.   Antiferromagnetic
   3.   Diamagnetic
   4.   Ferrimagnetic
9. Which of the following is not an example of 13-15 compound
   1.   InSb
   2.   GaAs
   3.   CdSe
   4.   AlP
10. The packing efficiency for a body centered cube is
    1.   42.0
    2.   68.0
    3.   74.0
    4.   52.0
11. In a face centered cubic unit cell of close packed atoms, the radius of atom (r) is related to the edge length (a) of the unit cell by the expression.
    1.   r = a / 2√2
    2.   r = a / 2
    3.   r = a / √2
    4.   r = √3a / 4
12. The number of tetrahedral and octahedral voids in a face centered unit cell are
    1.   6, 12
    2.   2, 1
    3.   4, 2
    4.   8, 4
13. In a fcc arrangement of P and Q atoms, where P atoms are at the corners of the unit cell, Q atoms at the face centres and two atoms are missing from two corners in each unit cell, then the formula of the compound is
    1.   P₂Q₃
    2.   P₄Q₅
    3.   PQ₄
    4.   P₄Q
14. Close packing is maximum in the crystal, which is
    1.   bcc
    2.   fcc
    3.   simple cubic
    4.   all
15. In which of the following defect structures, the cations are present in interstitial sites?
    1.   Schottky defect
    2.   Metal deficiency defect
    3.   Frenkel defect
    4.   Interstitial defect
16. To get n-type doped semiconductor, the impurity to be added to silicon should have the following number of valence electrons?
    1.   2
    2.   5
    3.   3
    4.   1
17. The appearance of colour in solid alkali metal halides is generally due to
    1.   Schottky defect
    2.   Frenkel defect
    3.   Interstitial position
    4.   F-centres
18. If NaCl is doped with 10^-4 mol % of SrCl₂, the concentration of cation vacancies will be (N_A = 6.02 x 1023 mol-1)
    1.   6.02 x 10¹⁷ mol^-1
    2.   6.02 x 10¹⁶ mol^-1
    3.   6.02 x 10¹⁵ mol^-1
    4.   6.02 x 10¹⁴ mol^-1
19. The cubic unit cell of Al (molar mass = 27 g/mol) has an edge length of 405 pm. Its density is 2.7 g cm^-3 . The cubic unit cell is
    1.   face centered
    2.   body centered
    3.   simple
    4.   primitive
20. A compound is formed by elements A and B. This crystallises in the cubic structure where A atoms are at corners of the cube and B atoms are at the body centres. The simplest formula of the compound is
    1.   A₈B₄
    2.   AB₆
    3.   A₆B
    4.   AB
21. In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be
    1.   X₃Y₄
    2.   X₄Y₃
    3.   X₂Y₃
    4.   X₂Y
22. The white ZnO turns yellow on heating because of
    1.   Metal deficiency defect
    2.   Frenkel defect
    3.   Metal excess defect
    4.   Schottkky defect
23. The crystal with metal deficiency defect is
    1.   NaCl
    2.   FeO
    3.   LiCl
    4.   ZnO
24. Percentage of free space in cubic close packed structure and in body centered packed structure are respectively
    1.   32 % and 48 %
    2.   48 % and 26 %
    3.   30 % and 26 %
    4.   26 % and 32 %
25. The percentage of iron present as Fe (III) in Fe_0.93O_1.0 is
    1.   8.3 %
    2.   9.6 %
    3.   11.5 %
    4.   17.7 %
26. Which of the following exist as covalent crystals in the solid state
    1.   Phosphorus
    2.   Iodine
    3.   Silicon
    4.   Sulphur
27. Iodine molecules are held in the crystals lattice by
    1.   London forces
    2.   Dipole-dipole interactions
    3.   Covalent bonds
    4.   Coulombic forces
28. Which type of defects are introduced by doping?
    1.   Dislocation defects
    2.   Electronic defects
    3.   Frenkel defects
    4.   Schottky defects
29. The lattice sites in a pure crystal cannot be occupied by
    1.   Molecules
    2.   Ions
    3.   Electrons
    4.   Atoms
30. Which of the following statements is not true?
    1.   Paramagnetic substances are weakly attracted by magnetic field.
    2.   Ferromagnetic substances cannot be magnetized permanently.
    3.   The domains in antiferromagnetic substances are oppositely oriented with respect to each other.
    4.   Pairing of electrons cancels their magnetic moment in the diamagnetic substances.