12th Class Physics Semiconducting Devices Question Bank

done A. R. (MCQs) - Semiconductor Electronics: Materials, Devices and Simple Circuits Total Questions - 9

• question_answer1)

  Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

  Assertion (A): The number of electrons in a p-type silicon semiconductor is less than the number of electrons in intrinsic silicon semiconductor at room temperature.

  Reason (R): It is due to law of mass action.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer2)

  Assertion (A): The resistivity of a semiconductor decreases with temperature.

  Reason (R): The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing it's resistivity.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer3)

  Assertion (A): As the temperature of a semiconductor increases, its resistance decreases.

  Reason (R): The energy gap between conduction band and valence band is small.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer4)

  Assertion (A): Silicon is preferred over Germanium for making semiconductor devices.

  Reason (R): The energy gap of Germanium is more than the energy gap of Silicon.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer5)

  Assertion (A): Semiconductors do not obey Ohm's law.

  Reason (R): V-I characteristic of semiconductors is linear.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer6)
                     

  Assertion (A): Zener diode is used as a voltage regulator.

  Reason (R): Zener diode operated in reverse biased condition.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer7)

  Assertion (A): Ideal diode shows zero resistance in forward bias and infinite resitance in reverse bias.

  Reason (R): Depletion region of a p-n junction diode extends in reverse bias and contracts in reverse bias.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer8)

  Assertion (A): When diode is used as a rectifier, its specified reverse breakdown voltage should not be exceeded.

  Reason (R): When p-n junction diode crosses the reverse break down voltage, it get destroyed.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer9)

  Assertion (A): When a p-n junction diode is reverse biased, a feeble reverse current flows known as reverse saturation current.

  Reason (R): In reverse bias condition, the minority carries can cross the junction.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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