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MCQs

Total Questions : 500 | Page 7 of 50 pages
Question 61. Electric dipole moment is expressed in debye unit.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 62. At room temperature the number of conducting electrons in an intrinsic semiconductor
  1.    Is about half the number of valence electrons
  2.    Is a very small fraction of the number of valence electrons
  3.    Is almost equal to the number of valence electrons
  4.    Is small as compared to the number of valence electrons
 Discuss Question
Answer: Option B. -> Is a very small fraction of the number of valence electrons
Question 63. Schrodinger wave equation is a
  1.    None of these
  2.    Differential equation
  3.    Partial differential equation
  4.    Linear equation
 Discuss Question
Answer: Option C. -> Partial differential equation
Question 64. Spontaneous magnetisation is characteristic of ferromagnetic materials.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 65. A vacant electronic state moves in the same direction as would a positive charge carrier.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 66. In solid insulator materials having only one kind of atom, the types of polarization which exist are
  1.    Electronic and ionic
  2.    Electronic only
  3.    Electronic, ionic and permanent
 Discuss Question
Answer: Option B. -> Electronic only
Question 67. In van der walls crystals, there exists a high degree of stability of the outer electron shell.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 68. The resistance of a photoconductor
  1.    Decreases with increase in light intensity
  2.    May increase or decrease with increase in light intensity
  3.    Increases with increase in light intensity
  4.    Remains constant
 Discuss Question
Answer: Option A. -> Decreases with increase in light intensity
Question 69. On the basis of the type of chemical bonds, solids may be classified into
  1.    Ionic crystal, valence crystals and metals
  2.    Ionic and valence crystals
  3.    Ionic crystals, valence crystals, metal and vander wall crystals
  4.    Ionic crystals
 Discuss Question
Answer: Option C. -> Ionic crystals, valence crystals, metal and vander wall crystals
Question 70. Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.
  1.    1, 2 and 3
  2.    1 and 2 only
  3.    1 and 3 only
  4.    2 and 3 only
 Discuss Question
Answer: Option B. -> 1 and 2 only

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