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MCQs

Total Questions : 500 | Page 4 of 50 pages
Question 31. The number of protons in a copper atom are
  1.    2
  2.    9
  3.    11
  4.    29
 Discuss Question
Answer: Option D. -> 29
Question 32. With increase in temperature, the electrical conductivity would
  1.    Increase in metals as well as in intrinsic semiconductor
  2.    Increase in metals but decrease in intrinsic semiconductor
  3.    Decrease in metals but increase in intrinsic semiconductor
  4.    Decrease in metals as well as in intrinsic semiconductor
 Discuss Question
Answer: Option C. -> Decrease in metals but increase in intrinsic semiconductor
Question 33. If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 34. The elements which become superconducting at extremely low temperatures are
  1.    Good conductors at room temperature
  2.    Ferromagnetic at room temperature
  3.    Relatively poor conductors at room temperature
  4.    Insulators at room temperature
 Discuss Question
Answer: Option C. -> Relatively poor conductors at room temperature
Question 35. The number of protons in a silicon atom are
  1.    4
  2.    8
  3.    12
  4.    14
 Discuss Question
Answer: Option D. -> 14
Question 36. The residual resistivity of a binary alloy at 0 K is
  1.    Sum of residual resistivities of component metals
  2.    Difference of residual resistivities of component metals
  3.    Product of residual resistivities of component metals
  4.    Dependent on the concentration of minor component in the alloy
 Discuss Question
Answer: Option D. -> Dependent on the concentration of minor component in the alloy
Question 37. Nickel is a non-magnetic material.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 38. The most important set of specifications of transformer oil include
  1.    dielectric strength and viscosity
  2.    dielectric strength and flash point
  3.    viscosity and flash point
  4.    flash point and viscosity
 Discuss Question
Answer: Option A. -> dielectric strength and viscosity
Question 39. If a small amount of Cu is added to Ni conductor, then
  1.    Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni
  2.    Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres
  3.    Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
  4.    Resistivity of Ni remains the same
 Discuss Question
Answer: Option C. -> Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
Question 40. The fact that domains exhibits spontaneous magnetisation is
  1.    First hypothesis is of Curie
  2.    Second hypothesis is of Weiss
  3.    Curie-Weiss law
  4.    Boltzmann’s statistics
 Discuss Question
Answer: Option B. -> Second hypothesis is of Weiss

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