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MCQs

Total Questions : 166 | Page 9 of 17 pages
Question 81. Is viscoelastic.
  1.    Cast-iron
  2.    Graphite
  3.    Rubber
  4.    Glass
 Discuss Question
Answer: Option C. -> Rubber
Question 82. By increasing impurity content in the metal alloy the residual resistivity always
  1.    Decreases
  2.    Increases
  3.    Remains constant
  4.    Becomes temperature independent
 Discuss Question
Answer: Option B. -> Increases
Question 83. Which of the following factors affect resistivity of metals ?
  1.    Age hardening
  2.    Alloying
  3.    Temperature
  4.    Cold work
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 84. Carbon bearings are used under which of the following conditions ?
  1.    Where lubrication is difficult or im-possible
  2.    Where corrosive chemical action exists
  3.    Where high temperature exists
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 85. For a hole which of the following statements is incorrect ?
  1.    Holes can exist in certain semiconductors only
  2.    Holes can exist in any material including conductors
  3.    Holes may constitute an electric current
  4.    Holes can be considered as a net positive charge
 Discuss Question
Answer: Option B. -> Holes can exist in any material including conductors
Question 86. Substances whose specific resistance abruptly decreases at very low temperature are called
  1.    Insulators
  2.    Conductors
  3.    Semiconductors
  4.    Superconductors
 Discuss Question
Answer: Option D. -> Superconductors
Question 87. The impurity atoms is semiconductors
  1.    Inject more charge carriers
  2.    Reduce the energy gap
  3.    Increase the kinetic energy of valence electrons
  4.    All of the above
 Discuss Question
Answer: Option B. -> Reduce the energy gap
Question 88. The photo-electric effect occurs only when the incident light has more than a certain critical
  1.    Intensity
  2.    Speed
  3.    Frequency
  4.    Wave length
 Discuss Question
Answer: Option C. -> Frequency
Question 89. Carbon rods are used in wet and dry cells because
  1.    Carbon rod serves as conductor
  2.    Carbon can resist the attack of battery acid
  3.    Both A and B
  4.    Either A or B
 Discuss Question
Answer: Option C. -> Both A and B
Question 90. The superconductivity is due to
  1.    The crystal structure having no atomic vibration at 0°K
  2.    All electrons interact in the super-conducting state
  3.    The electrons jump into nucleus at 0°K
  4.    None of the above
 Discuss Question
Answer: Option A. -> The crystal structure having no atomic vibration at 0°K

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