COMPASSLearning
RegisterLogin

CBSE Class 12 · 2002 · All India · SemiconductorsShort Answer

WhatsApp Email
In the diagrams shown, state which of the diodes are forward biased and which are reverse biased.

Answer: Diodes in figures (b) and (d) are forward biased; diodes in figures (a) and (c) are reverse biased.

Solution

A diode is forward biased when its p-side is at a higher potential than its n-side so that the arrow of the diode points from high to low potential.
Applying this to each circuit, the diodes in (b) and (d) have their p-side positive and are forward biased, while those in (a) and (c) have their p-side negative and are reverse biased.

CBSE Class 12 Board · 2002 · All India · Subjective

Practise more: all CBSE board PYQs on Semiconductors →

More board questions on Semiconductors

  1. A pure Si crystal having atoms is doped with 1 ppm concentration of antimony. If the concentration of holes in the doped crystal is found to be , the concentration (in ) of intrinsic charge carr …
    CBSE 2024View solution →
  2. (a) Explain the characteristics of a p-n junction diode that makes it suitable for its use as a rectifier.
    (b) With the help of a circuit diagram, explain the working of a full wave rectifier.
    CBSE 2024View solution →
  3. Explain the following, giving reasons.
    (a) A doped semiconductor is electrically neutral.
    (b) In a p-n junction under equilibrium, there is no net current.
    (c) In a diode, the reverse current is practically independent of the applied voltage.
    CBSE 2024View solution →
  4. In an extrinsic semiconductor, the number density of holes is . If the number density of intrinsic carriers is , the number density of electrons in it is
    CBSE 2023View solution →
  5. Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of
    CBSE 2023View solution →
  6. The formation of depletion region in a p-n junction diode is due to
    CBSE 2023View solution →