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MCQs

Total Questions : 166 | Page 3 of 17 pages
Question 21. Effect of moisture on the insulating materials is to
  1.    Decrease dielectric constant
  2.    Decrease dielectric strength
  3.    Decrease insulation resistance
  4.    Increase dielectric loss
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 22. Superconducting metal in super conducting state has relative permeability of
  1.    Zero
  2.    One
  3.    Negative
  4.    More than one
 Discuss Question
Answer: Option A. -> Zero
Question 23. Which of the following materials is the best conductor of electricity ?
  1.    Tungsten
  2.    Aluminium
  3.    Copper
  4.    Carbon
 Discuss Question
Answer: Option C. -> Copper
Question 24. Which of the following is the poorest conductor of electricity ?
  1.    Carbon
  2.    Steel
  3.    Silver
  4.    Aluminium
 Discuss Question
Answer: Option A. -> Carbon
Question 25. The conductivity of an extrinsic semiconductor with temperature
  1.    Decreases
  2.    Increases
  3.    Remains constant
  4.    All of the above
 Discuss Question
Answer: Option C. -> Remains constant
Question 26. Which of the following are non-conductors of electricity?
  1.    Non-metal solids except carbon
  2.    Air and most other gases
  3.    Pure water and liquids in general except mercury
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 27. Commonly used conducting materials are
  1.    Copper
  2.    Aluminium
  3.    Both A and B
  4.    Copper and silver
  5.    Platinum and gold
 Discuss Question
Answer: Option C. -> Both A and B
Question 28. Is the property of absorbing moisture from atmosphere.
  1.    Solubility
  2.    Viscosity
  3.    Porosity
  4.    Hygroscopicity
 Discuss Question
Answer: Option D. -> Hygroscopicity
Question 29. _______ is an example of piezoelectric material.
  1.    Glass
  2.    Quartz
  3.    Corrundum
  4.    Neoprene
 Discuss Question
Answer: Option B. -> Quartz
Question 30. On which of the following factors does the resistivity of a material depend ?
  1.    Resistance of the conductor
  2.    Area of the conductor section
  3.    Length of the conductor
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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