Donor and Acceptor impurities MCQ’s

Electronic Devices & Circuits Electronics & Communication Engineering

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Donor and Acceptor impurities”.

1. The opposite of ionization takes place at which temperature?
a) 0 K
b) ROOM
c) 300 K
d) 900K

2. What do you mean by the tem ‘FREEZE-OUT’?
a) All the electrons are frozen at room temperature
b) None of the electrons are thermally elevated to the conduction band
c) All the electrons are in the conduction band
d) All the holes are in the valence band

3. At what temperature the donor states are completely ionized?
a) 0 K
b) ROOM
c) 300K
d) 900K

4. Which of the following expressions represent the correct formula for the density of electrons occupying the donor level?
a) nd=Nd-Nd+
b) nd=Nd-Nd
c) nd=Nd+Nd+
d) nd=Nd+Nd

5. At absolute zero temperature, which level is above the Fermi energy level in the case of donors?
a) Donor energy level
b) Acceptor energy level
c) Conduction Band
d) Valence Band

6. At absolute zero temperature, which level is below the Fermi energy level in the case of acceptors?
a) Donor energy level
b) Valence Band
c) Conduction band
d) Acceptor energy level

7. Which of the following band is just above the intrinsic Fermi level for n-type semiconductor?
a) Donor band
b) Valence band
c) Acceptor band
d) Conduction band

8. At T=0 K, the location of Fermi level with respect to the Ec and Ed for the n type material is?
a) Above than conduction band
b) Midway
c) Lower than Ed
d) Greater than Ed

9.

electronic-devices-circuits-questions-answers-donor- acceptor-impurities-q9

For the above n-type semiconductor, what is B knows as?
a) Valence Band
b) Conduction Band
c) Donor Energy level
d) Acceptor energy level

10.

electronic-devices-circuits-questions-answers-donor- acceptor-impurities-q10

For the above given figure, identify the correct option for satisfying the above semiconductor figure?
a) P type, A-Conduction band, B-donor energy band, C- Valence band
b) P type, A-Conduction band, B-acceptor energy band, C- Valence band
c) n type, A-Conduction band, B-donor energy band, C- Valence band
d) n type, A-Conduction band, B-acceptor energy band, C- Valence band

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