Physics MCQs Public Service Commission Past Papers

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Q.1: p-n junction when reversed biased acts as a——–?

  1. capacitor
  2. inductor
  3. on switch
  4. off switch


Q.2: In n-p-n transistor, p works as——-?

  1. collector
  2. emitter
  3. base
  4. any of above


Q.3: Identify the correct statement about minority carriers——-?

  1. holes in n-type and free electrons in p-type
  2. holes in n-type and p-type
  3. free electrons in n-type and holes in p-type
  4. free electrons in n-type and p-type


Q.4: The velocity of an oscillating charge as it moves to and fro along a wire is always——-?

  1. constant
  2. zero
  3. changing
  4. infinite


Q.5: Which one of the following has the greatest energy gap ?

  1. insulator
  2. conductor
  3. semi conductor
  4. any of above


Q.6: Thermions are——–?

  1. protons
  2. positrons
  3. electrons
  4. photons


Q.7: In the transistor schematic symbol, the arrow——–?

  1. is located on the emitter
  2. is located on the base
  3. is locate on the collector
  4. points form north to south


Q.8: The semiconductor diode can be used as a rectifier because ——–?

  1. It has low resistance to the current flow when forward biased And high resistance when reverse biased
  2. It has low resistance to the current flow when forward biased.
  3. It has high resistance to the current flow when reverse biased
  4. Its conductivity increases with rise of temperature.


Q.9: The device or circuit used for conversion of A.C. into D.C. is called——–?

  1. An amplifier
  2. A rectifier
  3. Filtering circuit
  4. Converter


Q.10: The especially designed semiconductor diodes used as indicator lamps in electronic circuits are——?

  1. The switch
  2. The light emitting diode
  3. The photo diodes
  4. Solar cells.