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MCQs

Total Questions : 848 | Page 7 of 85 pages
Question 61. For most metals, Fermi level EF is less than
  1.    0.1 eV
  2.    2 eV
  3.    5 eV
  4.    10 eV
 Discuss Question
Answer: Option D. -> 10 eV
Answer: (d).10 eV
Question 62. The permeability of soft iron can be increased by
  1.    purifying it
  2.    reducing carbon percentage
  3.    alloying with cobalt
  4.    increasing percentage
 Discuss Question
Answer: Option C. -> alloying with cobalt
Answer: (c).alloying with cobalt
Question 63. The spins in a ferrimagnetic material are
  1.    all aligned parallel
  2.    partially aligned antiparallel without exactly cancelling out sublattice magnetisation
  3.    randomly oriented
  4.    all aligned antiparallel such that the sublattice cancels out exactly
 Discuss Question
Answer: Option B. -> partially aligned antiparallel without exactly cancelling out sublattice magnetisation
Answer: (b).partially aligned antiparallel without exactly cancelling out sublattice magnetisation
Question 64. The energy of one quantum of light equal to hf.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 65. For the n-type semiconductor with n = NP and P = ni² / ND , the hole concentration will fall below the intrinsic value because some of the holes
  1.    drop back to acceptor impurity states.
  2.    drop to donor impurity states
  3.    virtually leave the crystal
  4.    recombine with the electrons.
 Discuss Question
Answer: Option D. -> recombine with the electrons.
Answer: (d).recombine with the electrons.
Question 66. The effective channel length of a MOSFET in saturation decreases with increase in
  1.    gate voltage
  2.    drain voltage
  3.    source voltage
  4.    body voltage
 Discuss Question
Answer: Option A. -> gate voltage
Answer: (a).gate voltage
Question 67. The main purpose of using transformer coupling in a class A amplifier is to make it more
  1.    efficient
  2.    less costly
  3.    less bulky
  4.    distortion free
 Discuss Question
Answer: Option D. -> distortion free
Answer: (d).distortion free
Question 68. Which of the following is used in the sterilization of water?
  1.    Hydrogen bromide
  2.    Oxygen
  3.    Ozone
  4.    Caustic potash
 Discuss Question
Answer: Option C. -> Ozone
Answer: (c).Ozone
Question 69. Which of the following element does not have three valence electrons?
  1.    Boron
  2.    Aluminium
  3.    Gallium
  4.    Phosphorus
 Discuss Question
Answer: Option D. -> Phosphorus
Answer: (d).Phosphorus
Question 70. Pentavalent impurity creates n type semiconductor.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True

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