Solid States
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48. Which of the following defects is also known as dislocation defect?
(i) Frenkel defect
(ii) Schottky defect
(iii) Non-stoichiometric defect
(iv) Simple interstitial defect
48. Which of the following defects is also known as dislocation defect?
(i) Frenkel defect
(ii) Schottky defect
(iii) Non-stoichiometric defect
(iv) Simple interstitial defect
48. Option (i) Frenkel defect is correct since in this defect an atom is displaced from its lattice point to an interstitial site thus creating a vacancy at the lattice point. This usually occurs in those ionic crystals where the size of anion is quite large as compared to that of the cation. H
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47. The correct order of the packing efficiency in different types of unit cells is ________.
(i) fcc < bcc < simple cubic
(ii) fcc > bcc > simple cubic
(iii) fcc < bcc > simple cubic
(iv) bcc < simple > cubic
47. The correct order of the packing efficiency in different types of unit cells is ________.
(i) fcc < bcc < simple cubic
(ii) fcc > bcc > simple cubic
(iii) fcc < bcc > simple cubic
(iv) bcc < simple > cubic
47. Option (ii) The correct order of the packing efficiency is fcc > bcc > simple cubic
Packing Efficiency (fcc) - 74%
Packing Efficiency (bcc) - 68%
Packing Efficiency (simple cubic) - 52%
Upvote 46. A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because ________.
(i) All the domains get oriented in the direction of magnetic field.
(ii) All the domains get oriented in the direction opposite to the direction of magnetic field.
(iii) Domains get oriented randomly.
(iv) Domains are not affected by magnetic field.
46. A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because ________.
(i) All the domains get oriented in the direction of magnetic field.
(ii) All the domains get oriented in the direction opposite to the direction of magnetic field.
(iii) Domains get oriented randomly.
(iv) Domains are not affected by magnetic field.
46. Option (i) all the domains get oriented in the direction of magnetic field is correct since whenever a ferromagnetic substance is placed in a magnetic field it becomes a permanent magnet as all the domains get oriented in the directions of the magnetic field even after removal of
Upvote 45. Which of the following is not true about the ionic solids?
(i) Bigger ions form the close packed structure.
(ii) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.
(iii) Occupation of all the voids is not necessary.
(iv) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids.
45. Which of the following is not true about the ionic solids?
(i) Bigger ions form the close packed structure.
(ii) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.
(iii) Occupation of all the voids is not necessary.
(iv) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids.
45. Option (iv) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids is not true since the occupation of the voids depends upon the stoichiometry of the compound instead of the radii of the ions.
Upvote 44. Which of the following statements is not true?
(i) Paramagnetic substances are weakly attracted by magnetic field.
(ii) Ferromagnetic substances cannot be magnetised permanently.
(iii) The domains in antiferromagnetic substances are oppositely oriented with respect to each other.
(iv) Pairing of electrons cancels their magnetic moment in the diamagnetic substances.
44. Which of the following statements is not true?
(i) Paramagnetic substances are weakly attracted by magnetic field.
(ii) Ferromagnetic substances cannot be magnetised permanently.
(iii) The domains in antiferromagnetic substances are oppositely oriented with respect to each other.
(iv) Pairing of electrons cancels their magnetic moment in the diamagnetic substances.
44. Option (ii) Ferromagnetic substances cannot be magnetised permanently is correct since ferromagnetic substances are those which are very strongly attracted by the magnetic field and can be magnetized permanently.
Upvote 43. Silicon doped with electron-rich impurity forms ________.
(i) P-type semiconductor
(ii) N-type semiconductor
(iii) Intrinsic semiconductor
(iv) Insulator
43. Silicon doped with electron-rich impurity forms ________.
(i) P-type semiconductor
(ii) N-type semiconductor
(iii) Intrinsic semiconductor
(iv) Insulator
43. Option (ii) n-type semiconductor is correct since silicon is doped with electron rich impurities like Phosphorus or Arsenic and this leads to the increase in the conductivity due to the negatively charged electron . Hence, silicon doped with electron rich impurity is termed as n -type semic
Upvote 42. Which kind of defects are introduced by doping?
(i) Dislocation defect
(ii) Schottky defect
(iii) Frenkel defects
(iv) Electronic defects
42. Which kind of defects are introduced by doping?
(i) Dislocation defect
(ii) Schottky defect
(iii) Frenkel defects
(iv) Electronic defects
42. Option (iv) Electronic defects is correct since doping can be done with an impurity which is electron rich or electron deficient as compared to the intrinsic semiconductor like Si or Ge . Such impurities lead to the electronic defects in them.
Upvote 41. What is the coordination number in a square close packed structure in two dimensions?
(i) 2
(ii) 3
(iii) 4
(iv) 6
41. What is the coordination number in a square close packed structure in two dimensions?
(i) 2
(ii) 3
(iii) 4
(iv) 6
41. Option (iii) 4 is correct since in 2-D scope structure each sphere is in contact with four of its neighbours. Thus, its coordination number is found to be 4.
Upvote 40. In which of the following structures coordination number for cations and anions in the packed structure will be same?
(i) Cl ion form fcc lattice and Na+ ions occupy all the octahedral voids of the unit cell.
(ii) Ca2+ions form fcc lattice and F ions occupy all the eight tetrahedral voids of the unit cell.
(iii) O2 ions form fcc lattice and Na+ions occupy all the eight tetrahedral voids of the unit cell.
(iv) S2ions form fcc lattice and Zn2− ions go into the alternate tetrahedral voids of the unit cell.
40. In which of the following structures coordination number for cations and anions in the packed structure will be same?
(i) Cl ion form fcc lattice and Na+ ions occupy all the octahedral voids of the unit cell.
(ii) Ca2+ions form fcc lattice and F ions occupy all the eight tetrahedral voids of the unit cell.
(iii) O2 ions form fcc lattice and Na+ions occupy all the eight tetrahedral voids of the unit cell.
(iv) S2ions form fcc lattice and Zn2− ions go into the alternate tetrahedral voids of the unit cell.
40. Option (i) Cl-ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell is correct since In NaCl, chloride ion form fcc lattice and sodium ions occupy all the octahedral voids of the unit cell. The coordination number of both the cation and anion is
Upvote 39. Which of the following statement is not true about the hexagonal close packing?
(i) The coordination number is 12.
(ii) It has 74% packing efficiency.
(iii) Tetrahedral voids of the second layer are covered by the spheres of the third layer.
(iv) In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.
39. Which of the following statement is not true about the hexagonal close packing?
(i) The coordination number is 12.
(ii) It has 74% packing efficiency.
(iii) Tetrahedral voids of the second layer are covered by the spheres of the third layer.
(iv) In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.
39. Option (iv) since in this arrangement the spheres of fourth layer are exactly aligned with those of the first layer is correct since in hexagonal close packed structure there is ABAB.type arrangement which means that in this case spheres of third layer are exactly aligned with that of the f
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