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MCQs

Total Questions : 500 | Page 5 of 50 pages
Question 41. As the atoms of rare gases become larger, electronic polarizability
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    May increase or decrease
 Discuss Question
Answer: Option C. -> Remains the same
Question 42. Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
  1.    Normal to both current and magnetic field
  2.    In the same direction as current
  3.    In a direction anti parallel to magnetic field
  4.    None of the above
 Discuss Question
Answer: Option A. -> Normal to both current and magnetic field
Question 43. When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 44. The phenomenon of dielectric hysteresis occurs with
  1.    DC
  2.    AC
  3.    Both AC and DC
  4.    None of the above
 Discuss Question
Answer: Option B. -> AC
Question 45. The unit for mmf is
  1.    A
  2.    Wb
  3.    T
  4.    V
 Discuss Question
Answer: Option A. -> A
Question 46. When a material is in superconducting state and a magnetic field is applied
  1.    The superconducting property is not affected
  2.    The superconducting property may be affected and resistivity may increase from zero to a low value
  3.    The superconducting property may be destroyed
  4.    The material may become an insulator
 Discuss Question
Answer: Option C. -> The superconducting property may be destroyed
Question 47. The materials which become polarized on the application of mechanical stress are called piezoelectric.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 48. Which inductor is linear?
  1.    Sheet steel cored
  2.    Cast iron cored
  3.    Iron alloy cored
  4.    Air cored
 Discuss Question
Answer: Option D. -> Air cored
Question 49. For making a capacitor it is better to have a dielectric having
  1.    Permittivity which is neither high nor low
  2.    Low permittivity
  3.    Permittivity same as that of air
  4.    High permittivity
 Discuss Question
Answer: Option D. -> High permittivity
Question 50. As the viscosity of a liquid increases, the relaxation time
  1.    Decreases
  2.    Remains constant
  3.    Increases
  4.    First decreases then increases
 Discuss Question
Answer: Option C. -> Increases

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