DUET 2021 DU PhD in Electronics Question Paper with Answer Key PDFs (September 28 - Shift 2)

DUET Questions

• 1.

  The mobility of charge carriers increases with

  • increase in the average collision time
  • increase in the electric field
  • increase in the mass of the charge carriers
  • decrease in the charge of the mobile carriers
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• 2.

  What is the shape and magnetic nature of permanganate ion ?

  • Pyramidal diamagnetic
  • Tetrahedral, diamagnetic
  • Tetrahedral, paramagnetic
  • Planar, paramagnetic
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• 3.

  Which of the following statements is wrong?

  • Pollen grains remain viable for several months because their outer covering is made of sporopollenin
  • No enzyme can degrade sporopollenin
  • Pollen grains are well represented in fossil strata due to sporopollenin
  • Pollen wall has cavities containing proteins
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• 4.

  Phagocytosis and pinocytosis are collectively termed as

  • endocytosis
  • suspension feeding
  • omnivores
  • mucous trap
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• 5.

  During the phenomenon of resonance

  • the amplitude of oscillation becomes large
  • the frequency of oscillation becomes large
  • the time period of oscillation becomes large
  • All of the above
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• 6.

  How many $ 1\,\mu F $ capacitors must be connected in parallel to store a charge of $1\, C$ with a potential of $110\, V$ across the capacitors?

  • 990
  • 900
  • 9090
  • 909
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