Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

Identify the correct statements among the following.

(A) At 0 K, the resistance of a semiconductor is infinite.
(B) In an n-type semiconductor, the electron concentration is approximately equal to the concentration of donor atoms.
(C) In p-type semiconductors, the acceptor levels lie near the conduction band.
(D) In n-type semiconductors, the charge carriers are both electrons and holes.

Choose the correct answer from the options given below:

Options:

(A), (B) and (C) only

(B), (C) and (D) only

(A), (B) and (D) only

(A) and (D) only

Correct Answer:

(A), (B) and (D) only

Explanation:

The correct answer is Option (3) → (A), (B) and (D) only

Analysis of statements:

(A) At 0 K, the resistance of a semiconductor is infinite → True. No electrons are in the conduction band at absolute zero.

(B) In an n-type semiconductor, the electron concentration is approximately equal to the concentration of donor atoms → True. Electrons donated by donor atoms dominate.

(C) In p-type semiconductors, the acceptor levels lie near the conduction band → False. Acceptor levels lie near the valence band.

(D) In n-type semiconductors, the charge carriers are both electrons and holes → True. Electrons are majority carriers, holes are minority carriers.

Correct Statements: (A), (B), and (D)