Quiz  /  MCQ On Photodiode

  • 1. 
    Photodiode is used in the detection of

  • Visible light
  • Invisible light
  • No light
  • Both visible and invisible light

  • 2. 
    In using a photodiode as a photodetector, it is invariably reverse biased

  • The power consumption is much reduced compared to reverse biased condition
  • Only when the photodiode is reverse biased the incident photons produce electron-hole pairs
  • Only if the diode is reverse biased light variations can be converted into current variations
  • When photons are incident on the diode, the fractional change in the reverse current is much greater than the fractional change in the forward current

  • 3. 
    The maximum wavelength of photons that can be detected by a photodiode made by a semiconductor of bandgap 2eV is about

  • 620 nm
  • 700 nm
  • 740 nm
  • 1240 nm

  • 4. 
    The presence of dark current decreases the sensitivity of the photodiode to light

  • True
  • False

  • 5. 
    Photodiodes operate by absorption of photons or charged particles and generate a flow of current in an external circuit,……….. to the incident power. The light is absorbed ……….with distance and is ………..to the absorption coefficient.

  • Proportional, exponentially, proportional
  • Proportional, logarithmically, inversely proportional
  • Inversely proportional, exponentially, unrelated

  • 6. 
    What is the reason phototransistor produces more current than a photodiode?

  • A wider spectrum is accepted by the phototransistor than the photodiode
  • The current produced by photons is amplified by the h
  • of the transistor
  • The phototransistor can heavily doped than the photodiode
  • At low light conditions, a photodiode is used.

  • 7. 
    In a photodiode, when there is no incident light, the reverse current is almost negligible and is called

  • Zener current
  • Dark current
  • Photocurrent
  • PIN current

  • 8. 
    Compared to a photo-diode, which of the listed advantages and disadvantages would be expected of a phototransistor

  • Faster response and greater sensitivity
  • Faster response and less sensitivity
  • Slower response and greater sensitivity
  • Slower response and less sensitivity

  • 9. 
    When a diode is forward biased, the recombination of free electron and holes produce

  • Heat
  • Light
  • Radiation
  • All the above

  • 10. 
    The width of the depletion region is

  • Directly proportional to the doping
  • inversely proportional to the doping
  • Independent of doping
  • None of the above
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