On increasing the reverse bias to a large value in a PN-junction diode, current

(a) Increases slowly                  (b) Remains fixed
(c) Suddenly increases              (d) Decreases slowly

Concept Questions :-

PN junction
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the case of forward biasing of PN-junction, which one of the following figures correctly depicts the direction of flow of carriers

Concept Questions :-

PN junction
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be

(a) A P-type semiconductor                (b) An N-type semiconductor
(c) A PN-junction                               (d) An intrinsic semiconductor

Concept Questions :-

PN junction
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The approximate ratio of resistances in the forward and reverse bias of the PN-junction diode is

(a) ${10}^{2}:1$                     (b) ${10}^{-2}:1$
(c) $1:{10}^{-4}$                   (d) $1:{10}^{4}$

Concept Questions :-

PN junction
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a junction diode, the holes are due to

(a) Protons                               (b) Neutrons
(c) Extra electrons                     (d) Missing of electrons

Concept Questions :-

Types of semiconductors

Difficulty Level:

In forward bias, the width of potential barrier in a P-N junction diode

(a) Increases

(b) Decreases

(c) Remains constant

(d) First increases then decreases

Concept Questions :-

PN junction
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The cause of the potential barrier in a P-N diode is

(a) Depletion of positive charges near the junction

(b) Concentration of positive charges near the junction

(c) Depletion of negative charges near the junction

(d) Concentration of positive and negative charges near the junction

Concept Questions :-

PN junction

Difficulty Level:

In a PN-junction diode not connected to any circuit

(a) The potential is the same everywhere

(b) The P-type is at higher potential than the N-type side

(c) There is an electric field at the junction directed from the N- type side to the P- type side

(d) There is an electric field at the junction directed from the P-type side to the N-type side

Concept Questions :-

PN junction
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which of the following statements is not true

(a) The resistance of intrinsic semiconductors decrease with increase of temperature

(b) Doping pure with trivalent impurities give P-type semiconductors

(c) The majority carriers in N-type semiconductors are holes

(d) A PN-junction can act as a semiconductor diode

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon P-N junctions are

(a) Drift in forward bias, diffusion in reverse bias

(b) Diffusion in forward bias, drift in reverse bias

(c) Diffusion in both forward and reverse bias

(d) Drift in both forward and reverse bias

Concept Questions :-

PN junction