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MCQs

Total Questions : 166 | Page 8 of 17 pages
Question 71. The current due to electron flow in conduction band is the hole current in valence band.
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Greater than
Question 72. The metal having the lowest temperature coefficient of resistance is
  1.    Gold
  2.    Copper
  3.    Aluminium
  4.    Kanthal
 Discuss Question
Answer: Option A. -> Gold
Question 73. A perfect conductor has
  1.    Zero conductivity
  2.    Unity conductivity
  3.    Infinite conductivity
  4.    None of the above
 Discuss Question
Answer: Option C. -> Infinite conductivity
Question 74. For a particular material the Hall coefficient was found to be zero. The material is
  1.    Insulator
  2.    Metal
  3.    Intrinsic semiconductor
  4.    None of the above
 Discuss Question
Answer: Option B. -> Metal
Question 75. Total number of crystal systems is
  1.    2
  2.    4
  3.    7
  4.    12
 Discuss Question
Answer: Option C. -> 7
Question 76. Superconductors are becoming popular for use in
  1.    Generating very strong magnetic field
  2.    Manufacture of bubble memories
  3.    Generating electrostatic field
  4.    Generating regions free from magnetic field
 Discuss Question
Answer: Option A. -> Generating very strong magnetic field
Question 77. The converse of hardness is known as
  1.    Malleability
  2.    Toughness
  3.    Softness
  4.    None of the above
 Discuss Question
Answer: Option C. -> Softness
Question 78. In graphite, bonding is
  1.    Covalent
  2.    Metallic
  3.    Vander Waals
  4.    Vander Waals and covalent
 Discuss Question
Answer: Option D. -> Vander Waals and covalent
Question 79. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
  1.    Nichrome
  2.    Constantan
  3.    Kanthal
  4.    Molybdenum
 Discuss Question
Answer: Option A. -> Nichrome
Question 80. The value of critical field below the transition temperature will
  1.    Increase
  2.    Decrease
  3.    Remain unchanged
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Increase

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