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MCQs

Total Questions : 166 | Page 7 of 17 pages
Question 61. In a superconductor the value of critical density depends upon
  1.    Magnetic field strength
  2.    Temperature
  3.    Either A or B
  4.    Both A and B
 Discuss Question
Answer: Option D. -> Both A and B
Question 62. The conduction of electricity, in semiconductors, takes place due to movement of
  1.    Positive ions only
  2.    Negative ions only
  3.    Positive and negative ions
  4.    Electrons and holes
 Discuss Question
Answer: Option D. -> Electrons and holes
Question 63. The co-ordination number of a simple cubic structure is
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option B. -> 4
Question 64. In conductors conduction of electricity takes place due to movement of
  1.    Electrons only
  2.    Positive ions only
  3.    Negative ions only
  4.    Positive and negative ions
 Discuss Question
Answer: Option A. -> Electrons only
Question 65. A highly conductive material must have
  1.    Highest conductivity
  2.    Lowest temperature co-efficient
  3.    Good mechanical strength
  4.    Good corrosion resistance
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 66. Is an element used in semiconductors whose atoms have three valence electrons.
  1.    An acceptor
  2.    A donor
  3.    Germanium
  4.    Silicon
 Discuss Question
Answer: Option A. -> An acceptor
Question 67. The coils of D.C. motor starter are wound with wire of
  1.    Copper
  2.    Kanthal
  3.    Manganin
  4.    Nichrome
 Discuss Question
Answer: Option C. -> Manganin
Question 68. Due to which of the following factors the brush wear rate is altered?
  1.    Speed of the machine
  2.    Contact pressure
  3.    Surface conditions of brush and commutator
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 69. Which of the following affect greatly the resistivity of electrical conductors?
  1.    Composition
  2.    Pressure
  3.    Size
  4.    Temperature
 Discuss Question
Answer: Option A. -> Composition
Question 70. Carbon resistors are used extensively because they are
  1.    Easy to make
  2.    Compact
  3.    Inexpensive
  4.    All of the above reasons
 Discuss Question
Answer: Option D. -> All of the above reasons

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